Move final few ammo definitions to JSON.
Add tags_from_json() method to load a list of strings into a set.
Convert ammo_effects field to a tags set instead of a binary flag field.
Add floatation vest and associated logic.
Merge remote-tracking branch 'core/pr/1920'

Conflicts:
	data/raw/items/ammo.json
Merge remote-tracking branch 'origin/pr/1979'
Signed SIGNOFF file