[Cin] [PATCH] UnsafeGUI toggle, tooltips, file overwrite warning for batchrender.c

[Andrew Randrianasulu]

This time I tried to add user confirmation on project (EDL) file overwrite,
_in addition_ to gui toggle hiding this button.

Rafa Mar, I saw your letter, just tracking _where exactly_ this function writes file() turned out
to be harder than just adding warning. For now.
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