Option toggles require functionality

[marcobeltempo]

Currently, the options page has a set of preference toggles with no
backend functionality other than event listeners to detect when the
values have changed.
In order to save the users selection, we need to:

• utilize the change listeners in
  browser_extension/src/options_custom/settings.js
• update the value of our chaddonSettings object
  browser_extension/src/options_custom/settings.js#L10
• Use chrome.storage.sync to save the options within the browser

[marcobeltempo]

@EmdaviesSeneca how are the settings coming along?
I would commit each individual setting that you get working. This way we can catch anything early on.