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Media player was already stopped from the worker, and is anyway stopped
by the VLCMediaPlayer destructor

Non linux renderer widgets renderer (set_nsobject/set_hwnd) do not force
a vout back.

This reverts commit ffa7a222.
Slightly refactor the original version, but load settings by categories.
Loading everything from the settings file won't work on MacOS

Conflicts:
	src/Gui/MainWindow.cpp

Global replacement without checking is wrong. WRONG!

Those variables won't be saved to the preference file.
Private variables are meant to be saved, but must not generate any UI

Signed-off-by: Rohit Yadav <bhaisaab@baagi.org>

Loglines now contain thread ID, time, and a severity level marker