Implement raw javascript language

[gschwind]

Hello,

This patch suite add GodotJavaScript script language. JS scripts work the same as TS scripts and they share the same javascript environment, but they do not need to be compiled using "tsc", i.e. they are loaded in-place as they are.

The code are mostly shared by both ScriptLanguage, created classes are written to override names and file extensions.

Best regards

[ialex32x]

Hi, I’m not sure whether these changes are good for the design goal without side effects.

• Technically, typescript does not really exist at runtime, everything is javascript. The original implementation can directly load/run javascripts without further changes. The only limitation is you must create the javascript file in the external code editor if it’s a typescript project.
• It’s strongly not recommended to mix typescript and javascript in a typescript project if a javascript module is used as a script class, it may break the static type checkings. (for ordinary javascript files, they could still be used as libs in a typescript project)
• Simplicity and flexibility consideration: Introducing multiple ScriptLanguage instances brings additional costs, including the instances themself, separated script lists and corresponding locks.

I prefer to temporarily suspend this PR, and deliberate over it again after GodotJS (the expected features/implementation) is more complete.

[gschwind]

I'm fine with your opinion, I will maintain the patch series because I will use it, and you can merge it in the future if you want. if you have suggestion for improvement or change let me know.

Best regards