Linux VSTGUIEditor based UIs crash on frame->open()

The config pointer is set in VST3Editor::open , so any UI that derived from VSTGUIEditor is going to crash because the config pointer will be nullptr.

I managed to hack my way to victory. I’m thinking that RunLoop class should probably be in VSTGUIEditor and not VST3Editor.

Anyways, I’m up and running and it’s time for a rest.