Add /swap and /trail commands for maps and minigames!

Basically I’ve noticed that commands could be a bit more fun and useful for maps and mini-games, so I thought of a couple ideas. /swap would let you instantly switch positions between two entities, like a player and a mob, which could make puzzles, traps, or just funny moments way easier to do.

Then /trail would let players or mobs leave particle trails behind them, like smoke, fire, sparkles, or whatever you want. You could use it to follow someone in a minigame, make cool effects while exploring, or just add some style to builds. Both are simple but could really open up a lot of creative possibilities without being overpowered.