export TMap<FString, FString> to ZScript as Dictionary

[m8f]

Simple string-to-string map (dictionary) allows to store and retrieve key-value string pairs.

Extra feature: get serialized dictionary as a string, so the user can store it in a CVar. So this Dictionary can be used between games.

There are several mods in need of this data structure (Weapon Menu, Lazy Points, Target Spy). Maybe FragTrak could use it too.

PR: https://github.com/coelckers/gzdoom/pull/999

PS. It's no way I got everything right in unfamiliar code, so I'm ready to fix any issues.

[Player701]

I could really use a generic Dictionary<TKey, TValue> like in .NET. Too bad ZScript does not have generic types...

However, this particular one will probably come in handy as well. Thank you.

[Graf Zahl]

I am not a fan of such generic containers. At work I have to deal with a project which used these for all data storage. The result: It's impossible to track content because no error triggers the compiler's syntax check, it's all dictionaries with a wild mixture of object types in them. Refactoring that stuff to something robust is a nightmare and I very much prefer not to see that in GZDoom ever.