Remote Player Waypoints for Xaero's Map

features:

• now supports Minecraft versions from 1.16 to 1.21
• player waypoints now have better symbols (player-name abbreviation)
• display a message if lots of marker waypoints are shown letting the player now that they can decrease the distance or disable them
• hide waypoints for players visible on screen (using ray-casts)

fixes:

• fix an issue where waypoints would not get deleted if the mod was disabled
• fix Dynmap link handling again
• fix some Pl3xMap marker links
• prevent multiple update loop crashes
• don't create waypoints if the symbol and name are empty