Rework of the project related stuff:
- project dir contains only the model, the job and the interfaces (builder)
- projectcontroller and project are moved to shell with interfaces created
- project has quite some code commented out because the configuration stuff is missing in core still

Along the way fix installation for filemanager and persistenthash
Also along the way change some headers (like kdevlanguagesupport.h) to use IPlugin instead of Plugin to make the rest compile.