[modules/cmus] Re-add cmus module

Re-add a first version of the cmus module originally contributed by
@paxy97.

Still missing:
* Icon themes (status)
* On-click actions

see #23

bumblebee/util.py

@@ -18,4 +18,12 @@ def execute(cmd, wait=True):
         return out.decode("utf-8")
     return None
 
+def durationfmt(duration):
+    minutes, seconds = divmod(duration, 60)
+    hours, minutes = divmod(minutes, 60)
+    res = "{:02d}:{:02d}".format(minutes, seconds)
+    if hours > 0: res = "{:02d}:{}".format(hours, res)
+
+    return res
+
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