ChangeLog: Added changes from v2.6.0 release that are mentioned in commits

Authored by nmel on Apr 25 2018, 4:16 AM.

Description

ChangeLog: Added changes from v2.6.0 release that are mentioned in commits

Command used:
git log v2.6.0-master.. | grep 'FIXED:\|ADDED:\|UPDATED:\|CHANGED:\|REMOVED:' | sort

Applied minor corrections: letter cases and spaces.