LED & Gate

Milestone: https://github.com/magx2/openhab2-addons/milestone/1

Enchantments:

• Set white button for LED
• Turn OFF/ON in LED channel
• Add brightness for DIMMERANDRGBLIGHTING
• Migration to a Maven + Bnd based build system
• Support stop for roller shutters
• Support inverted logic

Bugs:

• Gate channels are not working correctly
• LED are not working correctly
• Support percent type when changing brightness on LEDs