Add configurable mouse movement and improve HID handling

web.py

@@ -151,10 +151,11 @@ def _page(settings):
 <label>Return interval <input name=return_min_seconds type=number min=1 value=%d> to <input name=return_max_seconds type=number min=1 value=%d> seconds</label>
 <label><input type=checkbox name=mouse_enabled%s> Inject mouse jitter</label>
 <label>Mouse interval <input name=mouse_min_seconds type=number min=1 value=%d> to <input name=mouse_max_seconds type=number min=1 value=%d> seconds</label>
+<label>Mouse movement distance <input name=mouse_distance type=number min=1 max=127 value=%d> pixels per event</label>
 <button>Save</button> <button name=action value=volume_up>Volume up</button> <button name=action value=volume_down>Volume down</button></form>
 <p><small>Changes take effect immediately. This HTTP interface has no TLS; use only a trusted training network.</small></p>""" % (
         _checked(settings, "enabled"), _checked(settings, "return_enabled"),
         settings["return_min_seconds"], settings["return_max_seconds"],
         _checked(settings, "mouse_enabled"), settings["mouse_min_seconds"],
-        settings["mouse_max_seconds"],
+        settings["mouse_max_seconds"], settings["mouse_distance"],
     )