Add Support for RGB Hex Colors for 1.16.1

[Legoman99573]

With the addition of 1.16, hex colors were added to the game and was suggesting as this was missing. Most bukkit plugins use &#rrggbb to accomplish this and allow using hex color values instead of just &A-F and &1-9, even though its still supported.

[confuser]

Thanks for raising this. Looks like KyoriPowered/adventure#62 has added support, once a build is available I'll update BM.