Gravestones

- Changed the way schematics paste in (it now ignores air block in the schematic).

- Every block in the schematic thats not air will be clickable to open the grave.

- Cobblestone Walls now properly paste in.

- Added automatic update checker. It's automaticly going to check if there's a new version of the plugin available, and notify you if there is. You can disable the update checker in the config.

- Graves now properly spawn if you die from a creeper.