Made HeroChat and NoCheatPlus plugins optional.
Remove BanManager classes/references to them. Global banning and mute systems should be handled by other plugins.
Made perk system more configurable.

- Removed perk database requirement, you can now toggle perk system on/off
- Added free perk options for users and admins so players can play with custom templates without relying on perk system.
- Added configurable URLs so we're not redirecting users to dead website URLs.
Make structure validation optional.
Fix whitespace problems in perks.yml.
Make VanishNoPacket optional.
Added Pagination to perks list.
Added debug option to print out heartbeat
Added MC version to heartbeat
Merge pull request #1 from netizen539/master

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