Update from upstream SpigotMC
Included Commits:
Update IRC channel to irc.spi.gt SpigotMC/Spigot@a791c555e7bf83fe51a3f96b0cdf873c1c76620c
Remove inv close patch for now SpigotMC/Spigot@a3abb3bea9f64ffc4e566b00088cf76fbdf1d582
Limit TNT Detonations per tick SpigotMC/Spigot@8f9c601aed5d90e721707d2706238fe17cb27722
Use sane default config values SpigotMC/Spigot@1cbbb9b62e683110cb82a1c0270a4985593c9a3b

These commits were not included as they were quickly reverted:
Only close if we are actually placing a block SpigotMC/Spigot@ea0b1b2d67d49f26d7ec5b7208e1f367f61cb54f
Revert for the above SpigotMC/Spigot@28faa0bd20db58a9d18db37a0cdc4b1c16021e64
Add isUnbreakable and setUnbreakable to ItemMeta. Also fixes a bug wh... SpigotMC/Spigot@32e6d74a5f08b29dcb0f6fe5fac77dc55ee70542
Revert for the above SpigotMC/Spigot@4b5a26b11c737aa52fee132d98d729d2e64120c1