Update v0.12.4

Small update to fix some of the bigger issues raised recently.

Fixes:

• Fixed the bug introduced in v0.12.3 that would delete items when equipping something and there wasn't enough space for the just-unequipped item

• Fixed various hammer-built buildings/shelter pieces not repairable when damaged

• Reworked shadow rendering rendering pipeline to reduce potential for race condition related crashes on certain hardware configurations