[#589] Optimize me.Color.equals and me.Color.clone
[#589] Optimize me.Color.equals and me.Color.clone

- These methods now use glArray directly, which saves the getter/setter round trip
- The constructor and setColor methods have been updated to accept individual Number arguments OR a single Float32Array argument
- Standardize on "alpha" naming convention instead of just "a"

rlugojr/melonJS,srbala/melonJS,srbala/melonJS,melonjs/melonJS,gopalindians/melonJS,TukekeSoft/melonJS,MarkoIvanetic/melonJS,MarkoIvanetic/melonJS,gopalindians/melonJS,gopalindians/melonJS,srbala/melonJS,rlugojr/melonJS,TukekeSoft/melonJS,rlugojr/melonJS,TukekeSoft/melonJS,melonjs/melonJS