ObjC: added @class forward def to helloworld

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: added new Prepare category to post-process the parsed AST before doing anything else

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: provide -attributes getter; call -prepare after parsing

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: added Prepare category to project

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: removed current*** variables in grammar - this will be done by the prepare tree walker

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: should now better handle @class and typedef

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: removed NSLog() from scanner; improved node types for comments

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: renamed semantic analyser to Postprocess

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: renamed files and incudes to Postprocess.h/.m

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: added visual AST inspector

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: added Inspector to project files

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: allow to open Inspector from debugger on any AST node

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>