RFC: Structure of background parser and language support

[Kris Wong]

> Maybe this is expected, but opening real projects is a PITA after your
> changes. The walking of the project filelist and adding 
> documents to the
> parser happens in the GUI thread, which means the GUI is frozen for
> about 2 minutes on kdevelop. 
> 
> Is that really supposed to happen?

It's really not completely optimized at this point, but 2 minutes seems
a bit excessive.  How big is the project?  kdevelop.kdev4 (as a custom
project) opens much faster than that for me.  It can easily be disabled
by commenting out the code in Project, though.

Kris Wong