Resolve "Upgrade flutter framework and dependencies"

Closes #58

See merge request !52

Resolve "Fix application game name"

Closes #54

See merge request !51

Resolve "Enable splash screen"

Closes #56

See merge request !50

Resolve "Add a "moves count" indicator"

Closes #55

See merge request !49

Resolve "Add a "pick random image" button"

Closes #49

See merge request !48

Resolve "Clean data provider code"

Closes #52

See merge request !47

Resolve "Normalize layout"

Closes #48

See merge request !46

Resolve "Fix / update layout"

Closes #47

See merge request !45

Resolve "Add personal pictures"

Closes #46

See merge request !44

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

Closes #43

See merge request !41

Resolve "Upgrade Flutter framework and dependencies"

Closes #45

See merge request !43

Resolve "Clean code"

Closes #44

See merge request !42

Resolve "Upgrade flutter framework and dependencies"

Closes #42

See merge request !40

Resolve "Add GPLv3 license"

Closes #41

See merge request !39

Resolve "Replace images by personal or free images"

Closes #26

See merge request !38

Resolve "Add abstraction to allow other games"

Closes #33

See merge request !32

Resolve "Add fastlane metadata"

Closes #37

See merge request !37

Resolve "Improve select picture page"

Closes #39

See merge request !35

Resolve "Preload winning image"

Closes #38

See merge request !36

Resolve "Set fixed orientation"

Closes #40

See merge request !34