Riftris v1.4

I want to use this project as a base for future work, so I've decided to add options that are expected from real games. This led to the creation of this update's main feature: the modular menu system.

Trello board: https://trello.com/b/jB0u4Pkf/riftris
Project Files: http://duncanhemingway.com/downloads/6-Riftris-files.zip
Game .exe - Win64: http://duncanhemingway.com/downloads/6-Riftris.zip