Adds the Minstrel, a lightly armored duelist who uses the power of song to bolster strength and incapacitate foes. Implements 20 new abilities split across 5 ability trees and 2 additional artifacts (which form a set).

This is my first mod for ToME4, so if you encounter any bugs or balance issues, feel free to let me know!

The source code is available here: https://github.com/ArtixBot/tome4-minstrel