[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/prime.py

@@ -0,0 +1,68 @@
+# pylint: disable=C0111,R0903
+
+"""Displays and changes the current selected prime video card
+
+Left click will call 'sudo prime-select nvidia'
+Right click will call 'sudo prime-select nvidia'
+
+Running these commands without a password requires editing your sudoers file
+(always use visudo, it's very easy to make a mistake and get locked out of your computer!)
+
+sudo visudo -f /etc/sudoers.d/prime
+
+Then put a line like this in there:
+
+    user    ALL=(ALL) NOPASSWD: /usr/bin/prime-select
+
+If you can't figure out the sudoers thing, then don't worry, it's still really useful.
+
+Parameters:
+    * prime.nvidiastring: String to use when nvidia is selected (defaults to 'intel')
+    * prime.intelstring: String to use when intel is selected (defaults to 'intel')
+
+Requires the following executable:
+    * prime-select
+
+contributed by `jeffeb3 <https://github.com/jeffeb3>`_ - many thanks!
+"""
+
+import core.module
+import core.widget
+import core.input
+
+import util.cli
+
+
+class Module(core.module.Module):
+    def __init__(self, config, theme):
+        super().__init__(config, theme, core.widget.Widget(self.query))
+
+        core.input.register(self, button=core.input.LEFT_MOUSE, cmd=self.__chooseNvidia)
+        core.input.register(self, button=core.input.RIGHT_MOUSE, cmd=self.__chooseIntel)
+
+        self.nvidiastring = self.parameter("nvidiastring", "nv")
+        self.intelstring = self.parameter("intelstring", "it")
+
+    def __chooseNvidia(self, event):
+        util.cli.execute("sudo prime-select nvidia")
+
+    def __chooseIntel(self, event):
+        util.cli.execute("sudo prime-select intel")
+
+    def query(self, widget):
+        try:
+            res = util.cli.execute("prime-select query")
+        except RuntimeError:
+            return "n/a"
+
+        for line in res.split("\n"):
+            if not line:
+                continue
+            if "nvidia" in line:
+                return self.nvidiastring
+            if "intel" in line:
+                return self.intelstring
+        return "n/a"
+
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4