`literally` Special Form

[Mercerenies]

Provide a literally directive. literally takes a literal symbol and outputs that symbol literally in the output code, bypassing any of the usual variable scope rules.

This can be used in two ways.

(+ (literally foo) 1) ==> foo + 1
((literally foo) 1) ==> foo(1)

These translations will take place regardless of whether there's a variable/function with the name foo in scope. Further, no macros or symbol macros with name foo will get expanded in either case; literally always bypasses macro calls.

This will primarily be used for testing purposes, but I don't think we should put it in sys/ because I feel that users may find it useful in macro expansion in some rare cases, and the behavior is pretty well-defined and simple.

[Mercerenies]

Consider how much name translation should take place.

• Do we want underscore-escaping on Godot keywords? (i.e. if => _if) Remember, underscore-escaping, at the moment, also takes place on primitive names.
• Do we want the usual escaping rules on symbols? (i.e. foo-bar => foo_bar or colorful? => is_colorful)

[Mercerenies]

7b1d4972229a39371d4123e9e526721ec2613d0c closes this issue.

We do the usual escaping on symbols but no keyword escaping, to allow access to underlying GDScript primitives.