- Adds proper marking of Load status for levelAsset, so if no mis file is defined then the asset fails to load and has proper error code
- Adjusts the get*Path() util methods for getting stuff like postFXPrefix or decal files to have a fallback if one isn't currently defined in the assetDef, as it could be a broken link but the file does exist
- Adjusts saving logic of level so it will properly update the levelAsset for postfx prefix or decal files so if they were added after creation of the assetdef, they're saved and updated as expected
- Adjusts the setter methods for the *File fields to correctly separate the File variable and Path variable to make things behave more clearly and consistently.
- Keeps checks for *.mis.decals file pattern, but shifts new creations of decals files to just be *.decals to better match other level-associated files like *.nav or *.forest
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