WIP: Update Angelscript to latest SVN revision

[codecat]

This updates Angelscript to the latest SVN revision. To put this in perspective: we're going from a 2014 version to a 2024 version.

Some things to note:

• I have not yet tested running this (I will do this shortly) - I've only made it compile (on Linux x86_64, at least). There are likely to be a lot of script errors and some runtime behavioral changes that might have to be tweaked.
• Some scripts had to be changed, mostly relating to String& function parameters. Typically the right way to pass strings around in scripts is using const String &in.
• I have updated addon_any to the latest upstream any addon from Angelscript, but I have not done this with dictionary and array. It could be worth upgrading these as well (there are quite a few bugfixes and optimizations there), but due to the large amount of changes required engine-wide, I have just modified them to make them work as-is for now.
• Angelscript has introduced the property keyword, which (by default) is required on any get_X and set_X functions, so that you can explicitly make them properties. We can revert that to the previous behavior, but that also means that get_length() and length() are at odds with each other. So I have removed the property accessors, since it seems there are no built-in scripts that are using them. (This means you can't do arr.length anymore, you have to do arr.length().)
• This will require quite some testing with existing scripts.

Will do some testing at runtime after I post this PR.

[codecat]

Seems to mostly run okay. I have only tested the main menu (without clicking on anything) and the deathmatch gamemode (without actually playing for real).

[codecat]

Note that this is still not ready for merging, there's still a couple problems I'm trying to fix in UI.

[codecat]

Alright I'm a lot more confident in the stability now - feel free to put this to the test!