First pass of 'favorite' shortcut. Add hypem implementation.

# What/Why?
Enables the user to specify a shortcut for 'favoriting' (or star-ing, like-ing, heart-ing, etc etc) on the active tab. 

# How was it tested?
It wasn't :( Still working on getting the testing framework down


cc @josefalcon 

Closes #2 for hypem.