enhancement: better config

[lostyawolfer]

server-side

• distance at which players start to fade out (because if i set the show distance really low i want the marks not to disappear immediately but to fade out);
• how much do they fade out;
• player coloring type (random, teams, player choice, always white);
• if it should do as in bedrock right now (replace the xp bar with an empty one to show the locator) (probably no one will use this but still its a good option to have)

client-side

• if it should still show the bar in creative or spectator

[SlyHatchet]

Could you include /vanish on the server side?