[insteon2] Initial contribution

[jsetton]

This is a rewrite of the Insteon binding adding some much needed improvements while keeping some of its core code refactored. Apart from simplifying the user experience by retrieving all the configuration directly from the device when possible, and improving the way the Insteon things are configured in MainUI, here is an exhaustive list of the changes:

• introduced device configuration automated determination
• converted mode-based number items to string type with descriptive states
• added number items uom support
• added distinct scenes and x10 device things
• added distinct bridge things for supported hub/plm devices
• added button event trigger channels
• added device products configuration layer
• added device link database support
• added device cache storage
• added device operating flags controls
• added modem configuration flags controls
• added related devices synchronization feature
• added heartbeat timeout monitor
• added ability to link/unlink a device to the modem
• added ability to add missing default links
• added link database & scene management support
• added scene state support
• added new i3 devices basic support
• added ezrain sprinkler device support
• revamped console commands with auto-completion support
• improved discovery service
• improved thing status

Since the configuration process was revamp, this is a breaking change with regards to existing user of the current binding requiring them to reconfigure their Insteon setup. This is why I am submitting a new separate binding with the expectation that the current one would be renamed as legacy allowing existing users to keep using that binding until they decide to move to the new one.