Python plugins

[rainestorme]

Bash plugins would obviously still be functional, but it would be nice to be able to use Python for more complicated logic and tasks. Doing so would require a working Python interpreter, which should be included in murkmod upon completion of #58. Similar to JS plugins, Python plugins would use a murkmod API, which would be installed from this repo using pip during murkmod setup, and kept up to date along with normal murkmod updates.