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Removed useless comments
Removed useless constructions of QFileInfo when creating a new Media instance.
Corrected header

Adapting MediaProperty window to use Clip

Conflicts:
	src/renderer/WorkflowRenderer.cpp
	vlmc.pro

This commit contains some crappy-things, such as a call to the mainloop
during a layout re-organisation and should be removed ASAP.

the MediaLibrary contains all of the media, but only gives access to the Clip, created upon the medias.
Cleaned metadata process: the clip doesn't appear inside of the mediaLibrary until the metadata process has been completed.
Removed junk/useless code

Removed debug

Solved missing icons for MediaProperty dialog

Basic start for medias's metatags. They're stored in the media, and displayed in the media property dialog

Cleaned MetaDataManager/Worker code, removed renderWidget, avoiding to permanent warning.

This reverts commit b99c1c6e.
There's a blocker which needs to be fixed first.