Rework themes support

- Add theme settings for figures.
- Settings for styles are now in it own class and
  ThemeSettings are wrapping those.
- Prefixed formatting string to have `style-` prefix.
- Templates can now use added `figures` dictionary which
  is resolved per activated theme.
- Create `dump` theme.
- New `ThemeActive` interface where default impl uses dump
  theme if `CI` or `NO_COLOR` env is set.
- Rework existing templates.
- Fixes #442

spring-shell-core/src/main/resources/org/springframework/shell/component/confirmation-input-default.stg

@@ -12,20 +12,20 @@ message(model) ::= <%
 // info section after '? xxx'
 info(model) ::= <%
 <if(model.defaultValue)>
-  <("(Y/n)"); format="item-disabled">
+  <("(Y/n)"); format="style-item-disabled">
 <else>
-  <("(y/N)"); format="item-disabled">
+  <("(y/N)"); format="style-item-disabled">
 <endif>
 %>
 
 // start '? xxx' shows both running and result
 question_name(model) ::= <<
-<("?"); format="list-value"> <model.name; format="title">
+<({<figures.questionMark>}); format="style-list-value"> <model.name; format="style-title">
 >>
 
 // component result
 result(model) ::= <<
-<question_name(model)> <model.resultValue; format="value">
+<question_name(model)> <model.resultValue; format="style-value">
 >>
 
 // component is running

spring-shell-core/src/main/resources/org/springframework/shell/component/multi-item-selector-default.stg

@@ -1,30 +1,30 @@
 // used to select style if item is selected/unselected
 selected_style(flag) ::= <%
-<if(flag)>item-selected<else>item-unselected<endif>
+<if(flag)>style-item-selected<else>style-item-unselected<endif>
 %>
 
 // selector rows
 select_item(item) ::= <%
 <if(item.onrow)>
-  <("> "); format="item-selector">
+  <({<figures.rightPointingQuotation> }); format="style-item-selector">
 <else>
   <("  ")>
 <endif>
 
 <if(item.enabled)>
   <if(item.selected)>
-    <("[x]"); format=selected_style(item.selected)> <item.name>
+    <({<figures.checkboxOn> }); format=selected_style(item.selected)> <item.name>
   <else>
-    <("[ ]"); format=selected_style(item.selected)> <item.name>
+    <({<figures.checkboxOff> }); format=selected_style(item.selected)> <item.name>
   <endif>
 <else>
-  <("[ ]"); format="item-disabled"> <item.name; format="item-disabled">
+  <({<figures.checkboxOff> }); format="style-item-disabled"> <item.name; format="style-item-disabled">
 <endif>
 %>
 
 // start '? xxx' shows both running and result
 question_name(model) ::= <<
-<("?"); format="list-value"> <model.name; format="title">
+<({<figures.questionMark>}); format="style-list-value"> <model.name; format="style-title">
 >>
 
 // within info section, dedicated instructions for user
@@ -48,7 +48,7 @@ comma_delimited(values) ::= <%
 
 // component result
 result(model) ::= <<
-<question_name(model)> <(comma_delimited(model.values)); format="value">
+<question_name(model)> <(comma_delimited(model.values)); format="style-value">
 >>
 
 // component is running

spring-shell-core/src/main/resources/org/springframework/shell/component/path-input-default.stg

@@ -1,11 +1,11 @@
 // message
 message(model) ::= <%
 <if(model.message && model.hasMessageLevelError)>
-<(">>>"); format="level-error"> <model.message; format="level-error">
+<({<figures.error>}); format="style-level-error"> <model.message; format="style-level-error">
 <elseif(model.message && model.hasMessageLevelWarn)>
-<(">>"); format="level-warn"> <model.message; format="level-warn">
+<({<figures.warning>}); format="style-level-warn"> <model.message; format="style-level-warn">
 <elseif(model.message && model.hasMessageLevelInfo)>
-<(">"); format="level-info"> <model.message; format="level-info">
+<({<figures.info>}); format="style-level-info"> <model.message; format="style-level-info">
 <endif>
 %>
 
@@ -18,12 +18,12 @@ info(model) ::= <%
 
 // start '? xxx' shows both running and result
 question_name(model) ::= <<
-<("?"); format="list-value"> <model.name; format="title">
+<({<figures.questionMark>}); format="style-list-value"> <model.name; format="style-title">
 >>
 
 // component result
 result(model) ::= <<
-<question_name(model)> <model.resultValue; format="value">
+<question_name(model)> <model.resultValue; format="style-value">
 >>
 
 // component is running

spring-shell-core/src/main/resources/org/springframework/shell/component/single-item-selector-default.stg

@@ -1,7 +1,7 @@
 // selector rows
 select_item(item) ::= <%
 <if(item.selected)>
-<("> "); format="item-selector"><item.name; format="item-selector">
+<({<figures.rightPointingQuotation> }); format="style-item-selector"><item.name; format="style-item-selector">
 <else>
 <("  ")><item.name>
 <endif>
@@ -9,7 +9,7 @@ select_item(item) ::= <%
 
 // start '? xxx' shows both running and result
 question_name(model) ::= <<
-<("?"); format="list-value"> <model.name; format="title">
+<({<figures.questionMark>}); format="style-list-value"> <model.name; format="style-title">
 >>
 
 // within info section, dedicated instructions for user
@@ -28,7 +28,7 @@ info(model) ::= <<
 
 // component result
 result(model) ::= <<
-<question_name(model)> <model.value; format="value">
+<question_name(model)> <model.value; format="style-value">
 >>
 
 // component is running

spring-shell-core/src/main/resources/org/springframework/shell/component/string-input-default.stg

@@ -5,7 +5,7 @@ info(model) ::= <%
     <model.maskedInput>
   <else>
     <if(model.defaultValue)>
-      <("[Default "); format="value"><model.defaultValue; format="value"><("]"); format="value">
+      <("[Default "); format="style-value"><model.defaultValue; format="style-value"><("]"); format="style-value">
     <endif>
   <endif>
 <else>
@@ -13,7 +13,7 @@ info(model) ::= <%
     <model.input>
   <else>
     <if(model.defaultValue)>
-      <("[Default "); format="value"><model.defaultValue; format="value"><("]"); format="value">
+      <("[Default "); format="style-value"><model.defaultValue; format="style-value"><("]"); format="style-value">
     <endif>
   <endif>
 <endif>
@@ -21,12 +21,12 @@ info(model) ::= <%
 
 // start '? xxx' shows both running and result
 question_name(model) ::= <<
-<("?"); format="list-value"> <model.name; format="title">
+<({<figures.questionMark>}); format="style-list-value"> <model.name; format="style-title">
 >>
 
 // component result
 result(model) ::= <<
-<question_name(model)> <model.maskedResultValue; format="value">
+<question_name(model)> <model.maskedResultValue; format="style-value">
 >>
 
 // component is running