Implement Settings

[florinzaicu]

Implement settings storage for the activity and add controls to:

• Allow the user to specify the size of the overlay
• Manage the collapse timer length (and potentially animation time)
• Change the colour of the application (force dark/light mode)

[florinzaicu]

Settings to allow managing the overly size, collapse timer, and transparency have been added in commit 0e68c42.

Control of the config will be moved to a separate activity layer on. For now, close off the task.