Added Inventory click actions:

Usage:
click-actions:
- "[message] Test"
- "[broadcast] Test"
- "[command] say test"

- Added conditions
- Added PlaceholderAPI support for conditions
- Added Equals Condition
- Added Permission Condition

- Fixed issues with glider deactivation
- Glider Item is now being removed when activated
- Recoded selection handling
- Added a way to specify default selected glider
- Added gamemode blacklist
- Fixed gliding in the water
- Fixed issues with fall damage
- Fixed a few minor bugs
- Added Glider Upgrades
- Added new economy adapters (EXP & Vault)