Add APPNAME, which contains the configured application name.
This will easily allow changing the application name later on.
* pitivi/check.py:
* pitivi/pitivi.py:
* pitivi/project.py:
* pitivi/ui/mainwindow.py:
Use configure.APPNAME for every string occurence of PiTiVi.
(PitiviMainWindow._setActions):
Don't set action string for some stock items. (NEW, OPEN, SAVE, SAVE_AS,
QUIT, FULLSCREEN, ABOUT). I'm leaving what we set for the others, since
I used them because I couldn't find any better icon.
Closes #339993


git-svn-id: svn+ssh://svn.gnome.org/svn/pitivi/trunk@776 d3729300-e425-0410-8a4c-d956edccc248