Fix "Softimage_Arnold_Standard" and "Softimage_Arnold_Dome_Light" Templates color profiles issues.

Closes KelSolaar/sIBL_GUI#189.
Implement precise per channel color control over the IBL setup in "Softimage" Templates.

Closes KelSolaar/sIBL_GUI#190.
Update templates documentation / help files.
Update documentation / help files.
Update "Templates_Releases.rc" releases file.
Merge branch 'feature/v2.1.0' into develop