#432 Injector improvements

- Separate FieldInjection from default fallback for no-Inject public no-args constructor classes
- Make CommandInitializer a normal, instantiable service
- Add various injections instead of fetching through command service

src/test/java/tools/commands/CommandPageCreater.java

@@ -35,7 +35,8 @@ public class CommandPageCreater implements ToolTask {
 
     @Override
     public void execute(Scanner scanner) {
-        final Set<CommandDescription> baseCommands = CommandInitializer.buildCommands(getMockInitializer());
+        CommandInitializer commandInitializer = new CommandInitializer(getMockInitializer());
+        final Set<CommandDescription> baseCommands = commandInitializer.getCommands();
         NestedTagValue commandTags = new NestedTagValue();
         addCommandsInfo(commandTags, baseCommands);