BIG UPDATE

New commands:
-/gm | Switches player between CREATIVE and SURVIVAL mode | gdtools.gamemode
-/gms | Puts player into SURVIVAL mode | gdtools.gamemode.survival
-/gmc | Puts player into CREATIVE mode | gdtools.gamemode.creative
-/gma | Puts player into ADVENTURE mode | gdtools.gamemode.adventure
-/gmsp | Puts player into SPECTATOR mode | gdtools.gamemode.spectator
-/kick | Kicks mentioned player with a reason | gdtools.kick
-/ban | Bans mentioned player with a reason | gdtools.ban
(The ban and kick screens are not customizable at the moment. This will be changed in a future update)
-/speed | Gives speed to the player | gdtools.speed
-/resistance | Gives resistance to the player | gdtools.resistance

Features:
-All potion commands' times and amounts can be customized in the config.yml
-Kick and Ban commands can be used from the console
-More messages were added to the config.yml
-Bans are UUID based

NOTE: I have decided to not make this plugin open source. The code is somewhat messy and I want to keep learning more before I make a plugin open source. Thank you for understanding!