[core] restructure to allow PIP packaging

OK - so I have to admit I *hate* the fact that PIP seems to require a
subdirectory named like the library.

But since the PIP package is something really nifty to have (thanks to
@tony again!!!), I updated the codebase to hopefully conform with what
PIP expects. Testruns so far look promising...

bumblebee_status/modules/contrib/rotation.py

@@ -0,0 +1,61 @@
+# pylint: disable=C0111,R0903
+
+"""Shows a widget for each connected screen and allows the user to loop through different orientations.
+
+Requires the following executable:
+    * xrandr
+"""
+
+import core.module
+import core.input
+
+import util.cli
+
+possible_orientations = ["normal", "left", "inverted", "right"]
+
+
+class Module(core.module.Module):
+    def __init__(self, config, theme):
+        super().__init__(config, theme, [])
+
+    def update(self):
+        widgets = self.widgets()
+        for line in util.cli.execute("xrandr -q").split("\n"):
+            if not " connected" in line:
+                continue
+            display = line.split(" ", 2)[0]
+
+            orientation = "normal"
+            for curr_orient in possible_orientations:
+                if (line.split(" ")).count(curr_orient) > 1:
+                    orientation = curr_orient
+                    break
+
+            widget = self.widget(display)
+            if not widget:
+                widget = self.add_widget(full_text=display, name=display)
+                core.input.register(
+                    widget, button=core.input.LEFT_MOUSE, cmd=self.__toggle
+                )
+            widget.set("orientation", orientation)
+            widgets.append(widget)
+
+    def state(self, widget):
+        return widget.get("orientation", "normal")
+
+    def __toggle(self, event):
+        widget = self.widget_by_id(event["instance"])
+
+        # compute new orientation based on current orientation
+        idx = possible_orientations.index(widget.get("orientation"))
+        idx = (idx + 1) % len(possible_orientations)
+        new_orientation = possible_orientations[idx]
+
+        widget.set("orientation", new_orientation)
+
+        util.cli.execute(
+            "xrandr --output {} --rotation {}".format(widget.name, new_orientation)
+        )
+
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4