Remove an imbrication in XML parsing, again similar to freetype.c

with vlc_object_release(). Also copied across some Null pointer checks.

being too large in full screen for some video modules.

Fix memory leak by unrefing the GdkPixBuf

Restore svn history for the lua modules (For future reference [21376]: modules/misc/lua: Share some code between the modules that uses lua and put them in a single module.)

- Do not refer to bogus TTL values

There is no way at the moment to know if a file is audio only

Even then rtp.c is quite big...

freetype: balance vlc_object_find() and vlc_object_release(), otherwise object is leaked (refcount > 0 on quit):

Fix some warnings

Add new module_FindName function to find a module when given it's name. Use this to fix the qt interface extended panel (video filters).
Change module_Exists to take the module name (and not short name) as parameter. Update the only known use of that function acordingly.