Added a option to let players fight the EnderDragon in Dragons mode.

This has not been fully tested with multiple players, please do some testing if you want to use it and report bugs via PM or Discussion.

• Enable it at Options.Game.Dragons-Fight-Mode.Enabled
• Options.Game.Dragons-Fight-Mode.Target-Sky-When-Hit
  • If enabled, the dragon will be forced to target the sky after getting hit
• Options.Game.Dragons-Fight-Mode.Allow-Solo-Mode
  • Allows players to play the gamemode solo
• Options.Game.Dragons-Fight-Mode.Dragons-Respawn
  • Allows Dragons to respawn
  • The max amount of Dragons alive at the same time is set by
    Options.Game.Max-Dragons
• Options.Game.Dragons-Fight-Mode.Goal
  • Set's the game goal, Goals:
  • KILLS_AMOUNT
    • When a player/team reaches a certain amount of Dragon kills
  • DAMAGE_DEALT
    • The max damage dealt by a player/team when the game time reaches 0 will win
  • DAMAGE_AMOUNT
    • When a player/team reaches a certain amount of Dragon Damage
• Options.Game.Dragons-Fight-Mode.Goal-Amount
  • Sets the goal amount, be kills or damage.
• Options.Game.Dragons-Fight-Mode.Fake-Damage
  • Disables dragon damage
• Options.Game.Dragons-Fight-Mode.Dragon-Health
  • Set's Dragon Health

Other changes:

• Fixed some holograms causing errors when the return value is not valid because the arena is still loading/restoring
• Fixed game would not end correctly if all players die in Dragons.
• Fixed players retaining some values after leaving a game that has ended
• Fixed Player Collision not being restored after being Spectator in a Game.

New EndGame message Placeholders:

• %damage_dealt%
• %kills%

The current Scoreboard system does not support per-player Placeholders, so only Team Damage/Kills Placeholders were added for the moment:

• %team_1_damage%
• %team_2_damage%
  
• %team_1_kills%
  
• %team_2_kills%