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.