update interfaces, manipulability, robots, world (+add/update corresponding examples)

examples/interfaces/mouse_keyboard.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+"""Load the mouse keyboard interface.
+"""
+
+from itertools import count
+
+import pyrobolearn as prl
+from pyrobolearn.tools.interfaces.mouse_keyboard import MouseKeyboardInterface
+
+
+# create simulator
+sim = prl.simulators.Bullet()
+
+# create mouse keyboard interface
+interface = MouseKeyboardInterface(sim)
+
+# run interface
+for _ in count():
+    # perform a step with the interface
+    interface.step()
+
+    # print pressed keys
+    if len(interface.key_down) > 0:
+        print("Keys that are pressed: {}".format(interface.key_down))
+
+    # perform a step with the simulator
+    sim.step(sleep_time=sim.dt)