AssetRegistry.bin population/merging

[trumank]

Asset registry files are stripped from mods since they are rarely used to access mods assets, however the official integration does attempt (it's very broken) to populate the game's asset registry with mod asset registries upon mounting. There are two ways this could be done:

Split mod registries with the game's registry as-is

• many mods don't include the asset registry
• many mods include asset registries with invalid entries

Parse mod asset contents to determine asset information to more accurately populate registry information

• depends on being able to accurately parse assets
• could be slow so would likely require caching mod metadata