Added support for Spigot/Minecraft 1.15

*NOTE* The following 1.14 only exploits have carried over into 1.15
Zero Tick Exploits, Villager Trade Cheesing, Villager Restock Time Exploit, Rail / Carpet Dupers, Villager Zombification Exploit.

Additionally the following long standing multi-version exploits are still confirmed working in 1.15 (likely to never be fixed by spigot)
All Nether/End portal dupe methods, Bedrock Destruction, TNT Dupers


Plugin Changes:
1) Reworked a couple of protections to use spigots NBT Api when possible, a few features still will require the use of NBTAPI (eg shulker box banning). This is because Spigot's api won't let us access the vanilla NBT Data only custom nbt data.