Design update and code enhancements

[bdlukaa]

• Display FPS on video info label
  The underlying player has been updated to listen to the estimated-vf-fps property.
• Add video label on fullscreen viewer
• Add the RECORDED label, displayed on Events
  With this label, info about the event is also displayed, such as the duration
• The amount of events fetched now depends on the connection type.
  On static connections, such as wifi and ethernet, 750 events are fetched. On other connections, such as mobile and bluetooth, the amount of events is limited to 200.
• Enhance app look-and-feel
  Update icons, test app on different themes and redistribute UI to avoid empty spaces (specially on larger screens).
  Fixes Add extra description on the "Downloads" page #140, Fixes Settings screen for large screens #138
• Reorganize code structure
  Reorganize folders, split widgets up and remove boilerplate code
• Camera View Fit is available on all video views