Draft: Add daily goals funcionality

[HighPriest]

Hello Adrian.

As an exercise in Android Development, I have decided to attempt extending your application with a "Daily goal" functionality.

TODO:

• [ ] Allow enabling Daily goal in Settings
• [x] Allow setting Daily goal in Labels Editor
• [ ] Display labels with incomplete Daily goal in main application view
  • ??Use a narrow RecyclerView on the side of the clock??
  • To be done, by querying DB for all sessions of the day and subtracting their length from the goal
• [ ] Display Daily goal target in Statistics, as a line in time history. To view how we were doing in completing daily goals over time.
• [ ] Add some form of alerts to motivate the user to change the current task.

It is my first time contributing to a foreign Android project, so any guidance as to what I might be doing incorrectly, is greatly appreciated. Especially because the project is so old, extensive and polished.

Example design of Main Activity Preview

[adrcotfas]

Thank you for your contribution but please keep in mind that I'm working on a new version of the app(from scratch) and I won't be able to use your work.