Implement pedometer tap to reset

**This commit relies on the PR wasp-os/bma42x-upy#1

* Implement touch action in pedometer app
* Impelement more efficient step counter reset

Author: Brandon Nolet

wasp/apps/steps.py

@@ -78,6 +78,13 @@ def _reset(self):
         self._wake += 24 * 60 * 60
         wasp.system.set_alarm(self._wake, self._reset)
 
+    def touch(self, event):
+        draw = wasp.watch.drawable
+        draw.fill(0x0000,60,112,180,40)
+        watch.accel.steps = 0      
+        
+        self._update()  
+
     def tick(self, ticks):
         self._count += 686;
         self._update()

wasp/drivers/bma421.py

@@ -48,6 +48,8 @@ def steps(self):
     def steps(self, value):
         if value != 0:
             raise ValueError()
-        # TODO: There is a more efficient way to reset the step counter
-        #       but I haven't looked it up yet!
-        self.reset()
+        # TODO once bma42x.py and the library it relies 
+        # on are modified to correctly implement 
+        # reset_step_counter, remove this useless param
+        self._dev.reset_step_counter(1)
+        time.sleep(0.05)