Upgrade to 6.1.2 — AudiobookConverter Steam update #1143050

Upgrade ffmpeg to 4.4.1 Fixed issue not loading year from m4b Fixed issue not loading book number from m4b and ogg Fixed issue not loading artwork from binary stream in m4b Fixed issue of extra spaces in suggested file name Fixed issue of sampling rate setting being ignored Fixed issue of some passing not compatible bitrate and sampling rate to m4b and ogg, which resulted failure to encode (probably reason of "Start button not working" Fixed issue failing to overwrite existing ogg file Improved VBR mode for opus (ogg) encoding Fixed error during joining mp3 files Fixed issue with large file size estimation Fixed issue with mp3 playback causes exceptions in logs Added feature: saving default chapter parameters to be used for next books Added feature: dark mode (About->Settings). Also added editable settings, which will allow more customosation in the future. Added feature: support source ...