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This reverts commit df19117a.

This reverts commit c277adec.

This reverts commit 27b832c3, reversing
changes made to c277adec.

This reverts commit e7b6d21a.

(coming soon :p )

Works for clip preview, doesn't work that much for render preview ATM...

This has only be tester with a Clip end date, not with an "unset" Clip
end.
Removed debug.

Some cosmetic on VLCpp::MediaPlayer
CheckVLCppException now prints the current function where the exception has been
thrown.

Library is now made of a GUI representation, and a frontend/backend,
that communicate with slots/signals
Also, VLCException must now be catched using the macro
CheckVlcppException, so that it prints out file and line of the error.

Small refactoring to prepare UI / Backend separation.

Metadata can be retrived, it just lacks some setters/getters :)

it will on next commit.
We don't use Media / [Input|Output]Media anymore.

xPosition is more efficient and make the code less error-prone than
time-based.

Please do not use 'this' pointer when it isn't required.