Best-effort to respect orientation for manual construction on-top ghosts entities.

[dupraz]

Currently, only reflection is respected (line 2), but not its rotation (line 3), which is inconsistent, and makes manual placement based on ghost planning quite tedious, where you have to press Q twice between each machine, such that the previous one is deselected, then the next one is selected in the right direction.

Even if you need the cursor preview to strictly overlap with the actual placement, a "best-effort" attempt would consider the possiblity of the entity being symmetrical in the relevant direction (most are in fact square) before discarding its ghost.