GroupCheck 1.8

- Rework processing to input values directly via getAttrByName and not rely on chat syntax
- Change arcane %attrname% syntax to more reasonable @{attrname}
- Added a helpful welcome message for new users
- Made the help actually useful by making it spit out a chat version of the README
- De-uglified chat output
- Add --raw option
- Various bugfixes
- Death saving throws added for 5E-Shaped and 5E-OGL