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-core/pom.xml

@@ -11,7 +11,7 @@
 		<artifactId>spring-shell-parent</artifactId>
 		<version>3.0.0-SNAPSHOT</version>
 	</parent>
-	
+
 	<description>Core API and classes for Spring Shell 2</description>
 
 	<dependencies>
@@ -31,7 +31,10 @@
 			<groupId>org.jline</groupId>
 			<artifactId>jline-terminal-jna</artifactId>
 		</dependency>
-
+		<dependency>
+			<groupId>org.antlr</groupId>
+			<artifactId>ST4</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.shell</groupId>
 			<artifactId>spring-shell-table</artifactId>