Chat Damage Buttons SWNR

A very simple module for apply health damage/recovery from chat log for Stars Without Number Revised. Largely extended from https://gitlab.com/hooking/foundry-vtt---chat-damage-buttons

This adds buttons on damage from weaponrolls and single hits and adds two buttons for subtracting roll from health or adding roll from health -- to one or more tokens that are selected. 

It likely works on older versions, but I have not done testing < 0.8.8