Introducing Unary Operators (Parsing)

[Alexius-Huang]

What?
Unary operators that operate with single operand. However, PR would be too large if also implementing unary operator declaration.

Why?
Unary operators are good for usage like: negative numbers etc.

How?
Support default unary operator which is - for negative numbers.

Sample Wyrd Code

foo = -123

Compiled Result

const foo = -123;