A new debugger.

Lots of bugs/rough edges/etc - issues will be filed.
Old-style debugging still works (just use --emit_source_annotations to get
the helpful movs back and --break_on_instruction will still fire).

src/xenia/kernel/xthread.cc

@@ -636,6 +636,10 @@ void XThread::SetActiveCpu(uint32_t cpu_index) {
   xe::store_and_swap<uint8_t>(pcr + 0x10C, cpu_index);
 }
 
+uint32_t XThread::suspend_count() {
+  return guest_object<X_KTHREAD>()->suspend_count;
+}
+
 X_STATUS XThread::Resume(uint32_t* out_suspend_count) {
   --guest_object<X_KTHREAD>()->suspend_count;