Resolve "Upgrade flutter framework and dependencies"

Closes #71

See merge request !65

Resolve "Enable splash screen"

Closes #69

See merge request !64

Resolve "Save current game, allow resume / restart"

Closes #51

See merge request !62

Resolve "Upgrade flutter framework and dependencies, clean/update code"

Closes #68

See merge request !63

Resolve "Improve app metadata, include fdroid metadata in repository"

Closes #67

See merge request !61

Resolve "Upgrade flutter framework and dependencies"

Closes #66

See merge request !60

Resolve "Add/improve levels"

Closes #64

See merge request !58

Resolve "Fix back to menu button"

Closes #62

See merge request !56

Resolve "Upgrade flutter framework and dependencies"

Closes #63

See merge request !57

Resolve "Add confirmation on restart game button"

Closes #57

See merge request !55

Resolve "Add first released (minor) version"

Closes #60

See merge request !54

Resolve "Fix duplicate in food skin"

Closes #59

See merge request !53

Resolve "Add license"

Closes #56

See merge request !51

Resolve "Fix freeze on end game animation"

Closes #55

See merge request !50

Resolve "Add board animations"

Closes #53

See merge request !49

Resolve "Add animations on cells"

Closes #54

See merge request !48

Resolve "Redraw game icons"

Closes #30

See merge request !47

Resolve "Improve fastlane images"

Closes #52

See merge request !46

Resolve "Improve randomization on images skins"

Closes #40

See merge request !41

Resolve "Save last game settings"

Closes #50

See merge request !43