Added seekbar reference
Added margin right
Added playback speed ui code
Merge pull request #51 from farezv/feature-playback-speed-ui

Feature playback speed ui
Minor tweaks for playback speed control

- Use descrete values by making the slider 0,1,2,3 and then calculate
  the real value in percentage
- Fix checked -> value for getting range value
- Make width smaller and show the percentage to the right of the control
- Removed some logging unrelated to this task, just threw it in for fun.

Test Plan:
- Load up settings, make changes, reload app, make sure changes are
  stillt here.
Add a flag so I can easily generate a list of youtub ids with titles

This was to help add Bengali support

Test Plan:
- None
Add a reset function to AppOptions so users can go back to their initial settings state.

Test Plan:
- Go to settings pane, change somet things. Call reset in dev console
  and make sure it updates.
Add a new button to reset all settings back to default

Test Plan:
- Change settings, click button, make sure it prompts and then resets
  only when you confirm