UI|Model Renderer|libgui: Loading and unloading packages using the Packages dialog
Anyone relying on ModelRenderer's ModelDrawable objects must observewhen they are deleted, e.g., when the package is unloaded.
Also fixed some problems with animator cleanup, where mobj thinkersdidn't deinitialize themselves properly.
View differences
UI|Model Renderer|libgui: Loading and unloading packages using the Packages dialog
Anyone relying on ModelRenderer's ModelDrawable objects must observe
when they are deleted, e.g., when the package is unloaded.
Also fixed some problems with animator cleanup, where mobj thinkers
didn't deinitialize themselves properly.