Added 1.17 support!
Added new action: [hasexperience], which checks if a player has a certain amount of EXP.
Added new action: [experience], adds/removes/sets EXP of a player. Use "+" to add, "-" to remove, and just the number to set it.
Added new action: [haslevels], which checks if a player has a certain amount of EXP levels.
Added new action: [levels], adds/removes/sets EXP levels of a player. Use "+" to add, "-" to remove, and just the number to set it.