[Haxe4] Support for `final` keyword

[Yanrishatum]

Haxe4 introduced a final keyword used in 2 places:

• Java-like, modifier to the methods. (Effect on autocomplete: Should not be shown in override completion.)
• Alternative for var keyword.

In-detail described here HaxeFoundation/haxe#6596
Feature already available in Haxe 4.0.0-preview.2 build.

[markknol]

When can we expect this? I'm starting to use Haxe 4 now, final is not shown in completion yet.

[SlavaRa]

@markknol the next week.

[markknol]

Great, looking forward to it!

[gene-pavlovsky]

Would be great to see this implemented :)

[markknol]

What is the status of this?

[SlavaRa]

@markknol hi, I'm very busy at work now:( but I will try to do it on the weekend or next week.

[markknol]

Sorry to bump this, but it would be super great if this works, now that Haxe 4 is released!