Added header files for the debugger.
Mostly finished debugger implementation.
Debugger works.
I added the bloon_filter and the basis for librarians.
Removed an unnecessary logging statement.
Merge branch 'debugger'

Conflicts:
	back_end/clocktroller/clocktroller.cc
	back_end/clocktroller/clocktroller.h
	back_end/opcode_executor/opcode_handlers.cc