Next Indigo beta to support .HDR format

We have just added support for the RGBE file format, better known simply as HDR files (from the .HDR extension).

While Indigo has always supported HDRI data, it could only load the OpenEXR format, with the RGBE format remaining a notable omission for a long time.

By popular demand we have finally added it to Indigo's feature list, and it will be available in the next beta version of Indigo Renderer and Indigo RT, version 3.6.9 (to be released soon).

.HDR file from http://www.lizardq.de