Few optimizations and added functionality

[carlosmax3D]

Hi, I'll use your base code to my project, I'm looking for a version of T3tris99, so I need faster and optimized code and your code was a good candidate to convert it to webassembly, I did a few changes like, use entirely stack memory and few optimizations using datatypes, added colors to shapes, anticlockwise rotation, added functionlity of hard-drop, hold, next 6 pieces and the best one, new lines at the botton using a variable, this one is for the battleroyal mode.

Hope you'll find it interesting.

Best regards.