Added functions to AssetManager to pack/unpack assets using an id hash instead of their id string this cuts down how much data is sent across the network for assets
All asset macros updated to use this new functionality.
Updates groundCover to utilize TerrainMaterialAsset macros in place of straight StringTableEntry for type layers
Fixes formatting for several asset types' inspector fields so they correctly call down into prompting the AssetBrowser being shown with correct field naming, thus allowing fields that are arrays to have the right index when setting the target variable
Updates several asset helper macros to handle blank values for network traffic to actually be sent to client, thus allowing setting an asset to blank on the client, rather than only falling back
