Initial contribution of thing concept.

Also-by: Oliver Libutzki o.libutzki@external.telekom.de
Also-by: Kai Kreuzer k.kreuzer@telekom.de
Also-by: Michael Grammling m.grammling@external.telekom.de
Signed-off-by: Dennis Nobel d.nobel@external.telekom.de
Merge pull request #33 from qivicon/thing-concept-contribution-final

Bug #433994: Initial contribution of thing concept.
CQ #8364
temporarily removed bindings from build
added export for core.binding package

Signed-off-by: Kai Kreuzer <kai@openhab.org>
Added ItemChannelLinkProvider and managedItemChannelLinkProvider.

Signed-off-by: Dennis Nobel <d.nobel@external.telekom.de>
Added some initial documentation structure

Signed-off-by: Kai Kreuzer <kai@openhab.org>
Merge pull request #34 from qivicon/item-channel-link-final

#433994: Added ItemChannelLink, ItemChannelLinkProvider and ManagedItemChannelLinkProvider.
CQ #8399