Integrate Houdini with Animation DNA

| Folders | Environment |

Folder structure

Houdini project root folder <rootProject>/PROD/3D, same as Maya project root.
Root for hip: <rootProject>/PROD/3D/scenes/FX
Cashes: <rootProject>/PROD/3D/cache. ABC - alembic, GEO - bgeo, VDB - volumes.
Houdini assets: <rootProject>/PROD/3D/hda
Textures: <rootProject>/PROD/3D/sourceimages
Further folder division should replicate Maya structuring consistently.

Environment setup

$JOB - root for Houdini project.
$HIP - path where Houdini scene is.
HOME - Houdini settings for user