Reco 2.3.0 Released

• @andreasomaini, who is the first coding contributor for this project, fixes the weird behavior of the countdown timer when pausing/canceling it! 🎉 A similar fix is addressed for the timer in the recording view too.
• The other biggest change of this version is that now Reco also supports recording sounds from both your microphone and PC at the same time, while it supports recording only either sounds at the same time in the previous releases.
• Now the app exits safely if the encoder is not created successfully
• The app description in the readme and AppCenter has been updated and gets more tantalizing
• Update Japanese translation
• Unnecessary field code that marks the app handleable files gets removed from the desktop file because Reco can't open files
• Source codes are cleaned as always; another small recorder refactoring has been addressed