[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...

setup.cfg

@@ -0,0 +1,52 @@
+[metadata]
+name = bumblebee-status
+author = tobi-wan-kenobi
+author_email = github@tobi-wan-kenobi.at
+url = https://github.com/tobi-wan-kenobi/bumblebee-status
+project_urls =
+    Documentation = https://bumblebee-status.readthedocs.io/
+    Code = https://github.com/tobi-wan-kenobi/bumblebee-status
+    Issue tracker = https://github.com/tobi-wan-kenobi/bumblebee-status
+
+description = a modular, theme-able status line generator for the i3 window manager.
+long_description = file: README.md
+long_description_content_type = text/markdown
+license = MIT
+classifiers =
+    Development Status :: 3 - Alpha
+    License :: OSI Approved :: MIT License
+    Intended Audience :: Developers
+    Programming Language :: Python
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.4
+    Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Topic :: Software Development :: Libraries
+    Topic :: Software Development :: Internationalization
+    Topic :: Utilities
+keywords = bumblebee-status
+
+[options]
+include_package_data = True
+allow-all-external = yes
+trusted-host =
+    gitlab.*
+    bitbucket.org
+    github.com
+packages = find:
+scripts =
+    ./bumblebee-status
+	./bumblebee-ctl
+	./bin/load-i3-bars.sh
+	./bin/pacman-updates
+	./bin/toggle-display.sh
+
+[versioneer]
+VCS = git
+style = pep440
+versionfile_source = bumblebee_status/_version.py
+versionfile_build = bumblebee_status/_version.py
+tag_prefix =
+parentdir_prefix =