Insteon_IOLinc: Filter Out Status Requests in Process Message

Needed to check if an incoming message is in response to a status request, before running it through the specialized _process_message.
Insteon_IOLinc: Redefine how IOLinc Sensors are tracked
Insteon_IOLinc: Add Request Sensor Status Sub
Insteon_IOLinc: Cleanup a few bugs
Insteon_IOLinc: Prepare for Resetting Relay State When Momentary Mode is Used
Insteon:  Add Initial Support for Linking i2cs Devices in MH

No longer do you have to manually link i2cs devices.

Added: enter_linking_mode()

Places the object into linking mode as if you had held down the set button on the device.  To create a link wherein the PLM is the controller, first run the PLM voice command "initiate link as controller". Then run this command.  Finally, run the voice command "scan link table" on this device.

This will eventually be merged into a simpler one-step method, however that will require some additional coding.
Insteon: Dont Just Decode the First Message

Typo in the Debug4 printout was causing the first message to be reprinted multiple times if multiple messages were received in one pass.
Insteon: Set Cmd2 to 00 in All Link Send Commands

Per the spec, Cmd2 should be 00, was getting set to FF when on command was sent.
Insteon: Catch Status Requests in Unique _process_message Routines

Controller and Security both have unique _process_message routines that catch messages unique to them.

Before processing a message, these routines need to check to see if the incoming message is in response to a status request.  Otherwise eventually the ALDB version number will match one of these unique message types, and MH gets confused.
Merge pull request #219 from krkeegan/insteon_iolinc

Updates to IOLinc Module, Significant Changes in Configuration
Merge pull request #218 from krkeegan/insteon_is_info_fix

Insteon: Catch Status Requests in Unique _process_message Routines
Merge pull request #213 from krkeegan/insteon_i2cs_linking

Insteon:  Add Initial Support for Linking i2cs Devices in MH
Merge pull request #214 from krkeegan/insteon_debug4

Insteon: Dont Just Decode the First Message
Merge pull request #216 from krkeegan/insteon_plm_scene

Insteon: Set Cmd2 to 00 in All Link Send Commands