[sensor] Fix ptu_posture incorrect handling of scene with multiples ptu

Instead of matching the exact name, try to match a regexp which consider
possible automatic renaming from Blender.

Fix #536

Based on a suggestion of Andrzej Pronobis in #537
[builder] Explictly call morseable after changing blender_object

Based on patch from Harmish Khambhaita

Fix #517
Merge remote-tracking branch 'upstream/1.2_STABLE' into 1.2_STABLE

Conflicts:
	src/morse/builder/morsebuilder.py