v0.3.0-alpha

This release completely refactors keyboard support, as well as windows, with SDL2.

• New key pressed, released, and hold functions
• Functions for creating and destroying windows

and other miscellaneous changes such as:

• a cleaned-up readme
• An example script to demonstrate keyboard support
• Changed speech libraries from Cytolk to Accessible Output 2
• Fixed many bugs littered throughout the example scripts and Horizon itself