Make the primitive types classes

[KCreate]

When doing a member expression or index expression on a non-object or non-array, the interpreter should look for a function on classes defined in primitives.charly.

This could work like this:

class Numeric {
  func times(callback) {
    let i = 0;

    # self automatically set to the number
    # can't be overwritten (see issue #31)
    while (i < self) {
        callback(i);
        i = i + 1;
    };
  };
};

"test".reverse(); # "tset"
25.times(func(i) {}); # Just like in ruby

Every class function or object function will get a pointer called self that will always point to the current object the function runs in. In this case it will be pointed to a primitive value. The interpreter redirects these calls at runtime.

[KCreate]

Method names for the overloaded operators should be (for now)

• + = __plus
• - = __minus
• * = __mult
• / = __divd
• % = __mod
• ** = __pow
• ! = __unot
• - = __uminus
• < = __less
• > = __greater
• <= = __lessequal
• >= = __greaterequal
• == = __equal
• ! = __notequal
• [] = __member
• [] = = __member_write
• ++ = __pplus
• -- = __pminus

[KCreate]

The ++ and -- operators will be added in a seperate PR

[KCreate]

Implemented via #58