add step hooks to make stepping work correctly for non isrs

Conflicts:

	Debug/openocd.gdbinit
	Debug/px4fmu-v1-board.cfg

Debug/openocd.gdbinit

@@ -1,7 +1,21 @@
 target remote :3333
-mon reset halt
+
+# Don't let GDB get confused while stepping
+define hook-step
+  mon cortex_m maskisr on
+end
+define hookpost-step
+  mon cortex_m maskisr off
+end
+
+mon init
+mon stm32_init
+# mon reset halt
 mon poll
 mon cortex_m maskisr auto
 set mem inaccessible-by-default off
 set print pretty
-source Debug/PX4
+source Debug/PX4
+
+echo PX4 resumed, press ctrl-c to interrupt\n
+continue