Breakpoints and Watchpoints

[mlafeldt]

Implement read, write, and execute breakpoints with proper address mask support. Watchpoints only watch for certain addresses to be executed.

When the breakpoint/watchpoint hits, the game pauses and reports back relevant information to the client. The game must be able to resume normal execution on demand.

Also see https://artemis.bountysource.com/task/show/2284