Remove hardcoded exterior world space ID list from WeatherManager

Summary

The NOT_EXTERIOR_WORLDS array in src/WeatherManager.h (used in WeatherManager::runWeatherTickImpl) contains a static, hardcoded list of Skyrim world space Form IDs that should be treated as non-exterior (i.e., no wind). This approach is fragile and difficult to maintain as it:

• Requires recompiling the DLL to add/remove world spaces.
• Does not account for modded world spaces that might also be interiors.
• Was originally added in commit 34743ff.

Goal

Remove the hardcoded list by doing one or both of the following:

1. Find a programmatic method — e.g., checking whether the world space has a valid sky/climate attached (similar to how the Creation Kit detects outdoor environments), or inspecting flags on the TESWorldSpace record. The RE server may have insight here.
2. Move to a data/config file — allow users/maintainers to configure the excluded world space IDs externally (e.g., in the existing SMP config file) rather than baking them into the DLL.

References

• PR #238 discussion: https://github.com/DaymareOn/hdtSMP64/pull/238#discussion_r2990702662
• Requested by: @alandtse