Auke Kok ecf160d93d Screwdriver: simplify logic, allow wallmounted rotation. ...

- Allow rotation of wallmounted nodeboxes (signs) since they are
  now rotating properly.
- Instead of testing `ndef` several times, do it once, correctly.
- Simplify exception logic for nodes that have `on_rotate` set.
- For simplicity, return itemstack, always.
- Remove a useless nil check.

2017-03-20 00:12:16 +00:00

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