Add version command

- Add new styling system which works around concept that
  you use tags to request jline styles where tags comes
  from an activated theme.
- There is a default theme with options to add custom
  ones and change it via property.
- Add templating system which uses antlr stringtemplate which
  allows to write output with a template instead of manually
  crafting code.
- Add version command which integrates to Boot's BuildProperties
  and GitProperties. Only version field is visible on default
  and others can be enabled/disable via properties.
- Fixes #352
- Fixes #353

spring-shell-standard/src/main/resources/META-INF/native-image/resource-config.json

@@ -3,7 +3,10 @@
     "includes": [
       {
         "pattern": "completion/.*"
+      },
+      {
+        "pattern": "template/.*.st"
       }
     ]
   }
-}
+}

spring-shell-standard/src/main/resources/template/version-default.st

@@ -0,0 +1,27 @@
+<if(buildVersion)>
+<("Build Version"); format="list-key">: <buildVersion; format="list-value">
+<endif>
+<if(buildGroup)>
+<("Build Group"); format="list-key">: <buildGroup; format="list-value">
+<endif>
+<if(buildArtifact)>
+<("Build Artifact"); format="list-key">: <buildArtifact; format="list-value">
+<endif>
+<if(buildName)>
+<("Build Name"); format="list-key">: <buildName; format="list-value">
+<endif>
+<if(buildTime)>
+<("Build Time"); format="list-key">: <buildTime; format="list-value">
+<endif>
+<if(gitShortCommitId)>
+<("Git Short Commit Id"); format="list-key">: <gitShortCommitId; format="list-value">
+<endif>
+<if(gitCommitId)>
+<("Git Commit Id"); format="list-key">: <gitCommitId; format="list-value">
+<endif>
+<if(gitBranch)>
+<("Git Branch"); format="list-key">: <gitBranch; format="list-value">
+<endif>
+<if(gitCommitTime)>
+<("Git Commit Time"); format="list-key">: <gitCommitTime; format="list-value">
+<endif>