Automatically pause core when changing breakpoints

No need to pause the core anymore before adding or removing breakpoints. Seems to work well.

https://github.com/hrydgard/ppsspp/blob/master/Core/Core.cpp#L289
The ifdefs here cause the disassembly to lose the current position in debug builds (it jumps to the PC on SetDebugMode). I wasn't sure what the purpose of the calls was, so I didn't want to remove them.