This is my first time modifying/extending a compiler (actually it is second after modifiying clang to add some poor man UFCS)

So excuse me for the quality of PR.

This adds enum bitflags which are enums with instead of contingous values, it will be conitgious bit flags

flag enum TextStyle {
    None, // 0
    Bold, // 1
    Italic, // 2
    Underlined, // 4
    Strikethrough // 8
};



bool main() 
{
    TextStyle style = TextStyle::Bold | TextStyle::Italic; // works without ERR cannot convert from int to TextStyle.
   if(style & TextStyle::Bold); // works
   if(!(style & TextStyle::Strikethrough)); // works
}

this also introduces a minor change to the bytecode format. Any previously saved bytecode to the new 1-byte flag marker. I am not sure if this is fine or should I pack it into some other variable for previous compatability? does angelscript gurantee script bytecode is always the same between major versions?

The test case is not the best but I also went ahead and used this pr in my own engine which uses angelscript and so far no crashes. so I hope it works and is up to the quality and the code format style.