Merge pull request #1229 from timblechmann/topic/qt5-win

Topic/qt5 win
gui: use deleteLater to avoid crash

Deleting the dialog directly causes a crash in QT5. deleteLater is the appropriate way to delete something that may have pending events. In this case, the crash is fixed, which suggests that there are indeed pending events depending on the dialog.
Merge branch 'qt52' of github.com:supercollider/supercollider into qt52
Apple build: Prevent supernova from being installed twice

Currently binaries (including supernova) land in Content/MacOS as defined here: https://github.com/supercollider/supercollider/blob/qt52/editors/sc-ide/CMakeLists.txt

Removed lines above want to install supernova again in the old location and thus create an install-error.
Merge pull request #1256 from bagong/patch-5

Apple build: Prevent supernova from being installed twice
Merge remote-tracking branch 'origin/qt52' into topic/qt5-win

Conflicts:
	server/supernova/CMakeLists.txt