Added transparent software breakpoint support for user debuggers:

* The bulk of the work -- i.e. juggling the software and hardware breakpoints,
  watchpoints, and memory reads/writes -- is done in the new class
  BreakpointManager.
* For the architectures a few capability macros have to be defined, one
  pointing to the software breakpoint instruction opcode. Done for x86.
* Some more simplifications in the user debugger code, made possible by the
  recently introduced debugger_changed_condition attribute.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31214 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/kernel/debugger.h

@@ -455,9 +455,6 @@ typedef struct {
 typedef struct {
 	debug_origin		origin;
 	debug_cpu_state		cpu_state;	// cpu state
-	bool				software;	// true, if the is a software breakpoint
-									// (i.e. caused by a respective trap
-									// instruction)
 } debug_breakpoint_hit;
 
 // B_DEBUGGER_MESSAGE_WATCHPOINT_HIT