Gravestones

- Graves don't spawn right on existing graves, they will look for the closest free spot (Most of the time in the air above the existing grave).

- The inventory of the grave expands dynamically depending on the amount of items you have.

- Graves spawning in mid-air or in water will use the gravestone_no_gravity schematic. This doesn't contain any gravel, to make sure the grave doesnt fall down. You can also change this schematic yourself if you want to.

- Added automatic error reporter. Errors will automaticly be send to me, so I can make sure to fix all the bugs.