Add status bar and more

This adds a status bar to the disassembly window: http://puu.sh/3PoPv/d343195e4b.png
You can disable it in the ini.

So far it displays:
-the address of a branch target, and its label name when it exists
-the value that is referenced by a memory opcode, [pos] = value at pos
-the exact position selected in the hex editor

Something else it could display, if that information is made available, is which breakpoint triggered because of what address.

Additionally, pressing right on a memory access opcode (ie lw, sh) will now display the memory viewer and set the cursor to the accessed position.