Clean / improve / update code

.editorconfig

.metadata

LICENSE.txt

README.md

android/app/build.gradle

android/app/src/main/AndroidManifest.xml

...rc/main/java/org/benoitharrault/hangman/MainActivity.java

android/app/src/main/res/drawable-v21/launch_background.xml

android/app/src/main/res/values-night/styles.xml

android/app/src/main/res/values/styles.xml

android/gradle.properties

assets/files/word-list-fr.json

assets/fonts/Nunito-Bold.ttf

assets/fonts/Nunito-Light.ttf

assets/fonts/Nunito-Medium.ttf

assets/fonts/Nunito-Regular.ttf

assets/images/gameover.png

assets/images/img1.png

assets/images/img2.png

assets/images/img3.png