Gas zombies!
Description and name change

Bloater kinda reminds me of the last of us, but is surely better than
reeker
Implemented action menu that makes available all actions.

No more painfully going through the options to find out what you can even do! Just open the action menu(needs to be bound first through the options, heh) and browse at your leisure.
Made the action menu display relevant context-sensitive actions at the top.
Added a cancel entry to action menus.
Added ACTION_EXAMINE to the context-sensitive checks.
Highlight things you can interact with in game::choose_adjacent.

This was surprisingly simple to implement.
Added control vehicle to the context sensitive check.
Merge gas zombies.
Merge action menu.