Make sure the game list gets created with automatic starts.
When rendering to the main window, the wxGLCanvas should really
be owned by the DolphinWX code for it to be safely freed.
Hack around the problem by just hiding the canvas for now.
Only update the game list when there may be changes to it.
When just starting and stopping emulation, just hide/show it,
but only if necessary because we are rendering to the main window.
Fixes issue 3460.