Android project upgrade/improvements

[neodesys]

Upgrade and improve Android project.

Nothing very important or urgent but a list of small improvements that may make our life easier in the long term.

• Upgrade project to the last versions of tools and dependencies.
• Use default folders for native code in order to allow Android Studio IDE to automatically finds the links between Java and native functions.
• Add editor-config, clang-format and clang-tidy configurations to ensure unified code style and static analysis for native code. Run those checks in the CI. Alternatively, depending if everybody is using Android Studio IDE or not, we may add specific .idea/codeStyles and .idea/inspectionProfiles folders to the project.
• Rationalize Java classes using native code to correctly call instance methods when suitable and not only static functions.
• Add disclaimer header to all files
• Fix MiniBrowser application styles and themes (unify colors and rationalize themes)