Fabric Custom Names

• Update to Minecraft 26.1.
• Add text_opacity and background_color options for the display_above_player config option. Old config files are automatically updated to include them.
• Port to NeoForge.

Please make sure to properly back up your world when updating! Minecraft 26.1 changes the structure of Minecraft worlds a lot, and while this mod has adjusted for that, I cannot guarantee that no data loss will happen!