C#: Document new version defines and remove mentions of old defines

[RedworkDE]

The version defines were added in godotengine/godot#78249 and godotengine/godot#78270

The feature defines haven't existed in a long time, and even if godotengine/godot#53920 finally gets anywhere, they will be in a different format, The architecture defines no longer exist either and there doesn't seem to be any plan / demand to reintroduce them.

For the platforms that have multiple defines we should probably just pick one to mention, but I am not sure which of them is preferred.

[raulsntos]

For the platforms that have multiple defines we should probably just pick one to mention, but I am not sure which of them is preferred.

I wonder why some platforms have multiple defines, probably a leftover from an older version.

For example, the Web platform used to be called JavaScript¹, and since Godot adds OS features for each platform it's likely that C# was just emulating this by adding the GODOT_JAVASCRIPT define, then when it was renamed we may have added GODOT_WEB but didn't remove the old one.

Also, at some point there was a html5 OS feature, but that doesn't seem to exist anymore either.

I guess the situation with (GODOT_OSX and GODOT_MACOS) and (GODOT_IPHONE and GODOT_IOS) is similar. These platforms were also renamed (OSX to MacOS and iPhone to iOS)².

We could probably remove the duplicate defines, although I guess it breaks compatibility. But I agree that we should only mention the could mention only one in the documentation so I'd pick the ones that match the platform name.

Footnotes

1. https://github.com/godotengine/godot/commit/d20b32186fc192f5e527a1211291b0cb293f4e66 ↩

2. https://github.com/godotengine/godot/commit/8823eae328547991def3b13ee2919291d29a278b ↩

[RedworkDE]

Ok, I removed the old apple platform defines and used GODOT_WEB as the define for the web platform, and let it do double duty as both the platform type and platform define.

[raulsntos]

LGTM

[mhilbrunner]

Thank you! Merged. And thanks Raul for reviewing :)