Set Spawn command (continuation of #2374)

[Wunka]

Changes to the PR #2374 from @Vinywar123 :

• renamed setSpawn command to spawn.
• only the server knows the spawn and gives it the player with the kill sync.
• when the spawn command is run with no parameters the command will return the spawnpoint.
• renamed the playerSpawnPoint variable to spawnPoint.

[Vinywar123]

thanks for picking this up