Rename corsika::State

enum class State { Unknown, Solid, Liquid, Gas, DiatomicGas };

Rename this to reflect the fact that it refers to state of matter. State can be useful in other context.

Indeed. This can be renamed to StateOfMatter easily.

created merge request !344 (merged) to address this issue

mentioned in merge request !344 (merged)

closed with merge request !344 (merged)

mentioned in commit 18d16d1c