New features:
• Added a built-in update checker to all Perf plugins
Improvements:
• New config option:update-checker.enabled: true(enabled by default)
Bug fixes:
• Border no longer spawns 2 blocks below the plot surface; default height is now at ground level
Improvements:
• Default forborder-height-offsetchanged from -2 to 0 (configurable: 0 = ground, positive = above, negative = below)
• /plotborder can only be used when standing on the ground; using it while flying (creative, elytra, or in air) is now denied with a message
• New message keymust-be-on-groundin messages.yml for the "no flying" notice
