French and Dutch translations

• Add French and Dutch translations (courtesy @Vistaus).
• Ensure that only one window of SongRec is present.
• Avoid to display "No match for this song" when multiple instances of SongRec would be displayed and one would be closed.

Minor fixes

• Include a "Cargo.lock" file in the project so that it can be accepted in certain packaging systems that require freezing Rust dependencies to a known subversion.
• Change the locale sent in HTTP requests to avoid to display internationalized song titles, in certain cases.
• Fix a minor typo in the algorithm implementation that shouldn't impact recognition.
• Improve portability.

Plane mode handling

• Display a clean "Shazam servers are not reachable, are you connected?" message on the GUI when the computer has been offline, rather than showing low-level errors.
• Improve cross-platform support.

Support for decoding more formats

• Try to decode input files with FFMpeg when it is available on the target system, in order to support more audio and video formats when recognizing from a file. This should allow for example to recognize music from .MP4, .AAC, .WMA files...when FFMpeg is installed on the system.

Allow copying song names easily

• The song recognition history now has a right-click context menu that allows to copy the name of the songs, artists, tracks or albums, or to search previously recognized songs on YouTube.
• It is now possible to select the name of the last recognized song so that it can be copy-pasted somewhere easily.

Recognition from the speakers

• Add the ability to recognize songs from your speakers rather than your microphone, through a checkbox that will be visible when the functionality is available, on compatible PulseAudio setups.

Responsiveness for mobile devices

• Make the application fully responsive for mobile devices using GtkFlowBox, thanks to @a33k.

Flatpak compatibility bis

• Use GtkFileChooserNative so that the application is able to graphically pick files through Flatpak without requiring further file system permissions.

Flatpak compatibility

• Add Flatpak packaging scripts and assets.
• Ensure that generated song lures don't last too long enough in certain cases.
• Remove the dash in the long application ID as it was incompatible with Flatpak

Initial Crates.io release

Tagging the initial Crates.io release