A single instance mode, so that opening files outside the ide will open in the instance currently running.
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Ive committed some code to do this on Win32.
Its disabled by default, and there is no gui options for it yet
so change or add "single_instance" to 1 under HostOptions to test it.
Added a gui option that is disabled for all platforms except WIN32.
The ide no longer has to be restarted for the change to take effect.