Update on July 6, 2024: Release of mod development tools

Update content:
1. The mod development tool has been released, including all the necessary code for mod development, but for tutorial, only creating character mods is available. Download mod development tools in: https://github.com/pcisdust/Eerie2 The installation method can be found in the documentation within the development tool.
2. Hard difficulty for the campaign. You can freely customize weapons without accessories in your backpack.
3. M870 model optimization.