Dolphin debugger enhancements

Added a "Step Out" (aka "Step return") function to the debugger.
Added a RAM watch window to the debugger.
Fixed a bug when stepping in JIT mode (where there was a breakpoint at the instruction being stepped).

@zhuowei might be interested in this.
Maybe just change this to an if statement, since it only has one case. If keeping the switch, things should be placed on the next line., etc.