Implement operator modifiers

[Bravotic]

Basically since Blæst is a single typed language, some things need to be inferred, some need to be explicitly stated. Using these operator modifiers, a single character, either f for floating point, s for signed, and u for unsigned can be applied to comparison (<, >) or arithmetic (+, -, *, /) operators to make those operators use appropriate opcode for translation. By default u is implied, so using it is only for clarification.

Examples:
x = 0.5 f+ 0.5;
if(-1 s< 5){