sim: added missing fake stubs for ctx.arc and positional captouch (fake fakes for those)

sim/fakes/ctx.py

@@ -122,3 +122,7 @@ class Ctx:
     def fill(self):
         self._emit(f"fill")
         return self
+
+    def arc(self, x, y , radius, arc_from, arc_to, direction):
+        self._emit(f"arc {x} {y} {radius} {arc_from} {arc_to} {direction}")
+        return self
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sim/fakes/hardware.py

@@ -396,3 +396,10 @@ def get_captouch(a):
     _sim.process_events()
     _sim.render_gui_lazy()
     return _sim.petals.state()[a]
+
+#TODO(iggy/q3k do proper positional captouch)
+def captouch_get_petal_rad(a):
+    return 0
+
+def captouch_get_petal_phi(a):
+    return 0
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