Remote Player Waypoints for Xaero's Map

features:

• mark as compatible with 1.21.7
• add support for LiveAtlas maps with Pl3xMap servers
• add support for a different Pl3xMap version

fixes:

• fix NullPointerException and IndexOutOfBoundsException error log spam
• correctly un-escape characters in waypoint names
• remove tags and trailing whitespace characters from waypoints
• limit waypoint abbreviation length to 3 to make it not render broken
• exclude more special characters from abbreviations