Adding Higher/Lower game to casino folder

[PhilStef]

Just a small addition to the game. Formatted it like the blackjack game. Might still be little things to fix inside but the structure and game is there.

[adamgulde]

This looks good and I'm sure it works well. The issue is you did not pull the latest changes from the codebase since commit f168d5b, and thus, it crashes when I try to test it with the updated codebase. If you look at commit 7563d15, you'll notice the update_quadrant() function no longer exists in screenspace.py, in favor of a better Terminal class which handles updating itself. Review the changed files in those commits, then update your code correspondingly and update this PR. Good work.