at the expense of magma no longer working (which will need to be done better anyway).
This:
- reverts the +0.01 outset which hugely exacerbated the lava bug (fixes#1892)
- adds a 0.001 inset (PC-style) which prevents entities incorrectly intersecting with diagonally adjacent blocks at far-ish coordinates (lava at x=4000, z=4000 is a good way to test this).
PR #1880 does also solve this issue, but again at the expense of magma. Since the bugfix does not require a big bounding-box handling refactor, it has been separated out.
cb90e30bcf