Initial contribution MAX! binding

Signed-off-by: Marcel Verpaalen <marcel@verpaalen.com>
MAX! binding Fixed NPE and updated acc to comments

Signed-off-by: Marcel Verpaalen <marcel@verpaalen.com>
MAX! Fixed second NPE
Merge branch 'max-4' of https://github.com/marcelrv/openhab2 into marcelrv-max-4
added the MAX! binding to the build

Signed-off-by: Kai Kreuzer <kai@openhab.org> (github: @kaikreuzer)