Better Flow for Device Handlers (Send, Rcvd, Functions)

[krkeegan]

Right now when creating an InsteonDevice the flow resembles

1. on init set to generic
2. init calls functions.initialize_device which creates the groups and at least adds the root as group 0x01
3. init also calls send_handler.intialize_device which runs a bunch of inits steps and calls Insteon_Device.update_device
4. update_device uses the dev_cat data to re-init the various handlers to their proper type

This seems circuitous. Some of this is needed, for example we need a generic send and rcvd handler to do a dev_cat query. But if we could condense this down, I am sure we would avoid some gnarly errors.