Update coloroo.lua

Removed __gt/ge as these are not used by Lua, removed double clamping in color constructor, fixed metatable usage, removed assertions for the lhs as nobody should ever do colorMeta.__div(notACocolor, something)(cause it's retarded), replaced c1/c2 with lhs and rhs as these are more descriptive(left hand side, right hand side).

Not tested but all these changes should be valid.