Release 2.6.0 ...

Kick off for discussions for release v2.6.0

Related tracker v2.6.0, v3.0.0 and general feature overview
- https://jogamp.org/wiki/index.php?title=SW_Tracking_Report_Objectives_for_the_release_2.6.0
- https://jogamp.org/wiki/index.php?title=SW_Tracking_Report_Objectives_for_the_release_3.0.0
- https://jogamp.org/wiki/index.php?title=SW_Tracking_Report_Feature_Objectives_Overview

We will move items between the version as appropriate.