Added .gitignore + Qt creator fix

Use .gitignore manually if you wish.
Qt creator couldn't find includes unless you specify "declaratives" in
*.pro file.
Simple sourceBrowser (Tree) added.

The simplest one!
Merge remote-tracking branch 'origin/devel' into 4356_source_browser

Conflicts:
	src/sca/sca.pro
	and some more files changed...
Merge remote-tracking branch 'origin/devel' into 4356_source_browser

Conflicts:
	src/sca/mainwindow.h
	src/sca/mainwindow.ui
	src/sca/sca.pro
	src/sca/sca.pro.user
	src/sca/objecttextviewer.cpp
	src/sca/objecttextviewer.h
Merge branch '4356_source_browser' into devel