Rework help command

- Change help command output to get templated using
  model classes.
- Remove things around ParameterDescription as those are
  replaced with template classes.
- Fixes for native configs.
- For now availability and aliases are removed from
  help to get back in better form.
- Aliases has been partly introduced to structure.
- Fixes #422

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

@@ -3,9 +3,6 @@
     "includes": [
       {
         "pattern": "completion/.*"
-      },
-      {
-        "pattern": "template/.*.st"
       }
     ]
   }

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

@@ -1,27 +0,0 @@
-<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>