Bluetooth added - but needs improvement

[ajohns1288]

I was able to hack together bluetooth and get it to send, however I know the permissions and all that won't work for most people. It's working perfectly for my use case, hopefully this would be a good starting point.

Drawbacks:
Must manually add bluetooth permissions in android settings
Must manually type in bluetooth device address
Output az/el always 3 digits (001...009, 010...099)

Format String
$AZ for azimuth, $EL for elevation, /r, /t, /n escape sequences supported.
Example: Sat is at 180az, 60el - W$AZ $EL\r will transmit W180 060 followed by a carriage return

[rt-bishop]

This is epic @ajohns1288, great job! Simple and clean integration. I'll merge it now but release later on with the next version. Will add several minor fixes as well when I manage to find some free time. Thanks for that!