[Debugger] Add method to get all Breakevents.
Merge pull request #7 from Therzok/addbe

[Debugger] Add method to get all Breakevents.
Merge pull request #6 from Therzok/master

[Debugger] Add parameter to enable implementation in CorDebug.
[Debugging.Client] Add a racy fix for a race condition

This code is not particularly threadsafe, but null checking the local
field before locking it is probably no worse than what's already there.