Add eraser-connector thing type definition.

ESH-INF/binding/binding.xml

ESH-INF/thing/thing-types.xml

META-INF/MANIFEST.MF

.../java/org/openhab/binding/openlicht/BindingConstants.java

...penhab/binding/openlicht/handler/AbstractMqttHandler.java

.../org/openhab/binding/openlicht/handler/EraserHandler.java

...enhab/binding/openlicht/internal/ConfigurationHolder.java

...b/binding/openlicht/internal/OpenLichtHandlerFactory.java