Add the thread priority to prevent unused sound thread use
Only use reflection method when API is unavailable for call
Stop redrawing the popup, Change enable state dynamically
Don't know about you, but I keep accidentally closing emu

This also removes the debug preference, since this menu is no longer
visible until pressed. If someone presses it by accident, they would
have probably enabled it by accident as well. Nothing dangerous is in
there anyway.
Merge pull request #268 from NoblesseOblige/master

More optimizations and stability stuff (Yah!!)