Syntax highlighting changes

[ryanabx]

• Adds the upcoming @abstract annotation https://github.com/godotengine/godot/pull/82987 (4.3) to the list of annotations in the gdscript textmate grammar. will move to a new PR nvm
• Complete syntax highlighting for properties. Class properties used to be unhighlighted (the only properties highlighted were . properties) and are now highlighted properly as variable.other.property.gdscript
• Treat void as a keyword instead of a class. See https://github.com/godotengine/godot/blob/a574c0296b38d5f786f249b12e6251e562c528cc/modules/gdscript/gdscript_tokenizer.h#L130C4-L130C8 (gdscript considers void to be a keyword, similar to C-style languages)

NOTE: This is my first time working with regular expressions, so please let me know if I've made a mistake with my added regular expressions!

Before:

After:

[atirut-w]

The new annotation should probably be in a separate PR that depends on https://github.com/godotengine/godot/pull/82987 being merged. The other two seems great for consistency.

[DaelonSuzuka]

The new annotation should probably be in a separate PR that depends on https://github.com/godotengine/godot/pull/82987 being merged.

No, there's no reason to push that out to another PR. Adding and removing annotations is a trivial change, and the linked engine PR seems quite likely to get merged.

The grammar in this extension is explicitly attempting to be a superset of all versions of GDScript, so adding support for future features is just as valid as maintaining support for Godot 3 features or features that were deprecated and removed.

[DaelonSuzuka]

Sorry for the delay. Everything looks fine to me.