v8.0.0 WFRP4e v8.x Compatibility; Add XP enhancements

This patch release raises the minimum compatibility to FVTT v12.331 and WFRP4e v8.0.2.

What's Changed

• Fix end of round operations happening every combat turn by @Jagusti in #276
• Make Add XP compatible with WFRP4e v8; add henchman support by @Jagusti in #277

Full Changelog: v7.1.1...v8.0.0