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This works for adding/removing clip

Added LibVLCpp::MediaPlayer destructor, avoiding event crashes
Fixed potential memory leaks
Removed junk code, corrected minor typo

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...

Also a warning removed.

It misses some frames, it also crash, but it's good enough for now.
I'll debug it as it goes.

It just lacks RenderPreviewWidget to query only one frame at a time.

This reverts commit 68f40c44.

This reverts commit 295c52c5.

At least one crash remains, and this hasn't been tester much yet...

Added a basic media player pool

It broked the uuid value on windows.

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)