Add debugging hotkeys

They are separated into 3 groups and will only be shown in the input config dialog if the emulator was in debug mode.

Source/Core/Core/HotkeyManager.h

@@ -40,6 +40,18 @@ enum Hotkey
   HK_EXPORT_RECORDING,
   HK_READ_ONLY_MODE,
 
+  HK_STEP,
+  HK_STEP_OVER,
+  HK_STEP_OUT,
+  HK_SKIP,
+
+  HK_SHOW_PC,
+  HK_SET_PC,
+
+  HK_BP_TOGGLE,
+  HK_BP_ADD,
+  HK_MBP_ADD,
+
   HK_TRIGGER_SYNC_BUTTON,
   HK_WIIMOTE1_CONNECT,
   HK_WIIMOTE2_CONNECT,
@@ -139,6 +151,9 @@ enum HotkeyGroup : int
   HKGP_SPEED,
   HKGP_FRAME_ADVANCE,
   HKGP_MOVIE,
+  HKGP_STEPPING,
+  HKGP_PC,
+  HKGP_BREAKPOINT,
   HKGP_WII,
   HKGP_GRAPHICS_TOGGLES,
   HKGP_IR,