Use game/mod-provided screwdriver handlers if present #368
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This PR ports the screwdriver code from Minetest Game. In their code, nodes can provide their handler to accept, reject, or do custom rotations. This change prevents weird rotations on nodes, e.g. battery box facing upwards.
For environments without a screwdriver mod, the old behavior is kept.
Note that some servers are using (abusing) the old behavior to trick man-made apple leaves to grow fruits. With this new change, it is no longer possible.
To do
This PR is ready for review.
How to test
on_rotate
handler.