Clean up All the things

``rc`` cleanup:
* Remove unneeded stuff at the top of the file
* Rename a few variables for consistency and clarity
* Add logic for sourcing ``/usr/lib/minirc/minirc.conf`` if ``/etc/minirc.conf`` does not exist
* Clean up a few variable declarations
* Add ``dhcpcd`` ``stop_process()`` logic

``minirc.conf``:
* Add ``wpa_supplicant`` to ``DAEMONS`` array (replacement for ``ALL_DAEMONS``)
* Add variable for wireless network interface to be used in the ``{start,stop}_process()`` cases

The ``minirc.conf`` in this format moves configuration outside the script itself, places it in a sane default location and offers simple logic for user-customization to override the defaults.


General tidiness:
* Removed ``aur_package/*`` as the files relevant to the AUR package are now maintained here: https://github.com/HalosGhost/Packages/tree/master/minirc-git