Arnold 7.1.4 support

[JenusL]

This update brings support for the following new Arnold features from Arnold 7.1.0 to 7.1.4

• Per axis texture on triplanar (v7.1)
• Flip opposite on triplanar (v7.1)
• Dual lobe phase function in standard_volume (v7.1.3)
• Physically correct volume emission scaling in standard_volume (v7.1.3)
• Blackbody intensity control in standard_volume (v7.1.3)
• Automatic generation of TX files (v7.1.4)
• Autodesk Analytics Program (ADP) settings. (v7.1.4)

SItoA improvements unrelated to Arnold version

• Exposed B-Spline and Linear interpolation basis of ICE curves.
• Support for shaders with multiple outputs.
• To demonstrate the new OSL shader build system. I included 4 previously unsupported original Softimage shaders, 2 of which have multiple outputs to also demonstrate that:
  • sib_boolean_to_color
  • sib_color_to_scalars
  • sib_vector_to_color
  • sib_vector_to_scalars

Incompatible / Behavior changes

• Pinned curves. SItoA now internally uses the wrap_mode setting on curves. This means Arnold is creating first and last segment of smooth curves at render time so they are not stored in the ass-file anymore, saving disk space (v7.1.3)
• Small UI fixes to standard_volume and checkerboard

Bugfixes

• None

Build system fixes / changes:

• Support for building standard Softimage shaders as OSL shaders.
• Patches newer versions of AdClm.
• Added exr and tx version of noIcon to test suite and updated tests to use it.
• New test 0274 to test shaders and shader compounds with multiple outputs.
• Small enhancements to dev env helpers.

Passes testsuite.