Hotfix 0.9.2.3

Hello, this is a hotfix to fix some small issues found after the last patch, but also includes a revised crater system based on the new empty shells that are much more efficient and allow for far more craters than before.

[h2]Changelog[/h2]

Improvements:
- Optimized crater system to support many more craters with less overhead

Bugfixes:
- Fixed some particle effects having sub-emitters with stop effects
- Fixed NRE caused by capturing a base with buildings that were previously on fire
- Fixed NRE caused by vehicles with a defensive mission having nothing to defend