remove any thread-safe stuff I introduced since it's not needed as unC0Rr pointed out it's not needed, we are single-threaded (thanks :D) from what I understood this time, Qt is clever enough to sequentialize all events and child destructions instead of spawning threads also some docs/comments

Fix for 'The "optimized" argument must be followed by a library.' cmake failure

adding simple doc build script

this should fix stylesheet importing on windows, but we'll see

fix of /saveStyleSheet command, error message on stylesheet import fail

tweak and document abstract page

on file save: create parent directories if needed

unbreak command auto-completion (was broken since r0b92341adb6a - 52 commits ago)