objectsDispose was originally disposed of at the end of the 
LoadFile function. However, we can dispose of it as soon as the
MakeFileObjectSoAJob is finished.

Also added an objectCount variable for clarity, and to avoid using 
objects.Length after scheduling objectDispose.Dispose.

The last Graphics.DrawMeshInstanced call is supposed to only render
stragglers that don't fit in full batches. However, instead it 
renders 1023 elements, rendering extra elements that shouldn't be there.
This mistake was probably due to a copy and paste error.

Fixed by introducing a stragglerCount to avoid calling % twice 
and to give better clarity.