Merge the format strings feature

[System-rat]

Implemented the format strings feature for generating easy format strings.

An example of the formatting language:

#include <iostream>
#include <Ansi>

int main() {
    std::cout << ANSI("#[Bold, Red, Underline, Italic]##TEXT##") << std::endl;
}

This should print out bold, underlined, and italic red text: #TEXT#

The parsed string is automatically cached