'is_data' since the move from 'cycles_shader_compat' (2.79) to 'PrincipledBSDFWrapper' (2.8) we lost the ability to (automatically) set this colorspace setting for imported textures. This was useful for e.g. normalmaps to always assume 'Non-Color' data. This adds the possibility to overide and uses this for normalmaps... Fixes T66368 Reviewers: mont29, brecht Maniphest Tasks: T66368 Differential Revision: https://developer.blender.org/D5176