New Data Format

The data format has been updated to work properly with the latest versions of rssitest and Audioloc.

The data it transmits now is in the following format:
{"NUM": n, "FNAME": "filename.mp3", "BSSID": RSSI, ... "BSSID": RSSI}

Auto generated release notes:

What's Changed

• Added an EnterText for audio file selection by @BUSH222 in #2

Full Changelog: v0.1...v0.2