4.x Update

[lukebemish]

This update has a number of major changes, centering on the changes to libraries - DynAssetGen and DefaultResources - and the conversion of the configuration system to use a registry-backed system.

[lukebemish]

A change I still need to implement is switching over texture generation to use a sprite source instead of the current setup... should be possible by serializing the texture sources I'm provided with?

[lukebemish]

Alright, most of the technical stuff is implemented - I still want to look at speeding up the worldgen chunk edge state cache if possible, as well as updating docs