[[Split portion of a mixed commit.]]

This is useful for bone chains that need their parent-child relationships
preserved exactly.  For example, bbone chains, and chains that users want to
use auto-ik on.
Also moved the 'copy' rig type to the basic collection.  This will break
some existing metarigs, but it is very easy to fix.  Just change the 'copy'
rig type on bones that use it to 'basic.copy'.

Added spacing_multiplier to object photons block so per object photon count tuning is now possible (see tooltip)

Reorganized the whole pov properties, to place them in PropertyGroups, rather than cluttering the Scene/Material/etc. objects’ spaces…
Also added a new file handling the conversion from existing files using the old pov properties (call the ˘povray render: update to script v0.0.9” operator (bpy.ops.scene.pov_update_properties) in the search box of the 3d views to make the conversion).

rearranged layout so everything is cleaner.

also write out deformed meshes as parentless since the bones `own` them.

thanks to jawra for the updates.

from Yaroslav Zubkov (yzubkov)

*Refactored the whole in-render loop, was inherited from POV 3.6 version, and no more relevant for POV 3.7…

- renamed: texpaint_ui.py -> texture_paint_layer_manager.py to follow naming conventions
- fixed the tracker url


[[Split portion of a mixed commit.]]

no need to double it up.

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updating regular solids add mesh script to version 2

Changed the way materials are exported to better work with DirectX's Phong-esque default specular shading.