Mozzie: Adds code to load list of published datarefs from <XP>/mozzie_publish.txt using XPDrefsFile parser.

XPDrefsFile: Adds code to parse a standard DataRefs.txt file. (TSV)

main: Updated version number and logging format strings.

Mozzie: Tweaks order of operations so that libmosquitto is properly serviced BEFORE we attempt to push data to it. Ensures that timed-out connections etc are dealt with properly.

Options: Filter \r\n chars from the end of values.

Options: Adds code to ignore comment lines that start with #. Adds code to create default mozzie_prefs.txt with sane defaults if the file does not exist.

Tweaked Log data.

Adds GPLv3 header to XPCmd.* and XPDref.*

Fixes Mozzie::xp_data_pump(). Can now send dataref data to the MQTT server.

Adds basic dref wrappers that will be used to perform a layer of delta-filtering so that only drefs with changes go out over the MQTT net.

Ported basic cmd handler. Need to expand to handle lots of buttons cleanly. Sub class or router class? Hmm..

Better support for Options and de-coupled connection to server from XPluginEnable()

Initial commit of basic framework required to bootstrap an MQTT plugin based on the Mosquitto library. Compiles and links. Untested.