Cleaning up and reformatting `.gitignore`.
Cleaning up and reformatting `.gitignore`.

Removing old app path ignores.
Generalizing Vim pattern.
Adding comments.
Converting to LF line endings.

graphis/lithium,datachand/lithium,wbeater/lithium,qoqa/lithium,datachand/lithium,muyehub/lithium,pixelcog/lithium,pixelcog/lithium,mehlah/lithium,davidpersson/lithium,jails/lithium,jails/lithium,mehlah/lithium,whowgames/lithium,UnionOfRAD/lithium,graphis/lithium,m4rcsch/lithium-core-library,davidpersson/lithium,muyehub/lithium,qoqa/lithium,SensCritique/lithium,whowgames/lithium,wbeater/lithium,UnionOfRAD/lithium,m4rcsch/lithium-core-library,SensCritique/lithium