Anki add-on: not maintained, don't use

This was a version of AwesomeTTS that works with Anki 2.1. Updated 1/12/2019: * Fix bug involving "async" keyword * For developers: add improved service testing capabilities * Make ImTranslator service work * Fix bugs involving error reporting * Several other small fixes * NOTE: This update makes NeoSpeech service not work. We will try to fix this in the next update. Updated 1/3/2019: * Improved internal error checking, fixing a few bugs * Switched to a more reliable networking library * Added full support for on-the-fly TTS generation