wifi, rss:  add 'good-enough' icons
icons: Add bluetooth
actions: Add close X
license: Release under LGPLv3+FE

The purpose of this odd license choice is so that this can be
* incorporated into LGPLv3 software
* "upgraded" to GPLv3+FE
readme: Initial documentation
build: Add Makefile
audio: Add speaker mute
audio: Add speaker low and medium
audio: Add speaker with high volume
sim card: Redesign icons to not use implicit inverting

This was removed from txt2sfn
initial commit: Format that can be converted into sfn by txt2sfn