Spectator Mode Request

Hello, I'm looking for a plugin for a Skywars server.

I need a spectator mode plugin which allows a player to automatically become a spectator of that game after their death. They cannot interact with anything in the game such as chests, dropped items, and players. The spectators must also be invisible without particles so the players will not be distracted. They are given 2 items in their hot bar which one... leads them to the spawn (/spawn) and the other opens up the remaining player's heads, in which they can teleport to, to spectate. Also if can, when the remaining players are shooting arrows at an opponent, a spectator cannot disturb that hit. (Spectators cannot disturb fired arrows or thrown enderpearls)

Spectators can fly.

One main thing that this plugin must have:
When the game ends, the spectators are forced to leave the game and end up at spawn.

Plugin must be compatible with 1.7.2-1.7.4
Please and Thank you