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Everything is now handled in frames, and not in "vlc positions"

This avoid deadlocks introduced in previous commit, and clarify the code.

Avoid duplicates item when loading a project.

Currently contains the track name and a button to disable the whole
track.

Some modifications should improve compile time a little bit.

However, it should not work (if it does, that's a ***ing miracle :o )

Two new buttons for choosing between move or split mode.
Two new buttons for zooming in and out.

Please note, this is only partially working. A bug in the backend
prevents the use of this functionnality.

Not needed anymore.
This reverts commit c7f780d7.

I finally renamed a method starting by m_, this was pissing me off for weeks :)
This solves the random crash due to letting Qt delete the main workflow. MainWorkflow is a QObject, but
it's not Qt's job to decide when to delete it, since it used by at least 2 widgets which are deleted in an
arbitrary order...

The clip QMap has been thread safed for the occasion (and to resolve a
few bugs)
Though, it seems to miss some events sometime (without crashing,
changing position is enough to restore the render preview)

Removed useless Track.cpp/h