aredn: Prepare the 3.21.4.0 release (aredn#92)

* aredn: Prepare the 3.21.4.0 release

* add Mikrotik mAntbox to README

aredn: Prepare 3.20.3.1 release (aredn#546)

aredn: Prepare 3.20.3.0 release (aredn#495)

aredn: Prepare 3.19.3.0 release (aredn#384)

AREDN 3.18.9.0 Release

build: bugfix version typo to aredn_packages

build: convert 3.16.1.1 to Makefile builds

Jenkins build split to new build structure

Version 3.16.1.1 as released.

Version 3.16.1.0 as released May 11th