Arduino CI fixes

No user-facing functional changes; strictly for test automation

1.4.0 - Added Python image converter, added FontB support, other fixes

Bump to 1.4.0

Runtime declaration of firmware version, fix CR handling, add setHeatConfig()

Fixes carriage return handling in write().
begin() now accepts an optional firmware version argument — this doesn’t CHANGE the firmware, it’s how you specify to the library what version is on your printer (this is shown on the test page) — default is 268 for printers with 2.68 firmware. This is a potentially breaking change in that earlier library releases accepted a “heat time” value here instead (now handled through the separate setHeatConfig() function), and having code present for multiple firmware versions will make the library ever-so-slightly larger, which could be an issue with large programs (e.g. with embedded bitmaps) most likely on AVR. The benefit is that one doesn’t have to edit the header file just to use this now, a vanilla install will suffice.

1.2.1 - Fixed compiler warning

Bump to 1.2.1

1.2.0 - Add to Action

Merge pull request #37 from adafruit/actionci

Moved to actions, added a bunch of doxygen

1.1.2 - Adding travis config

Update library.properties

1.1.1 release for Arduino

Possible fix for hasPaper() with newer printer firmware. Not extensively tested. No other changes.

1.1.1

proper release version

1.1.0 release for Arduino

Changed to Stream object in constructor rather than SoftwareSerial pin assignments; no longer depends on SoftwareSerial.