Added possibilty to use convert colors to sRBG color space

With the help of some BlenderMarket Customers in pointing out missing, important features (like converting
the material colors to sRBG before creating the image texture), I am confident enough to remove the "beta"
tag of this version :-)

Have fun!

Minor quality-of-life improvements

It is now possible to explicitly set the width and height of the tiles / image. Also it is tested on the new Blender release 2.81.

Beta relase for Blender 2.80!

This release is tested for the full release of Blender 2.80 and has some minor improvements over the alpha release.

First alpha release

This is the first runnable release of the Texture Atlas Generator. Be aware of bugs and dragons, since this is a very early alpha release ;-)