Previously the popup page fetched only the `ruffleEnable` and `ruffleOptout`
options because only those appear in `popup.html`. So the remaining
options were always returned with their default value, making the popup
page think that all tabs need to be reloaded when these options have a
non-default value.
Remove the `keys` parameter of `getOptions`, and instead make it always
return all options. Adapt all usages of `getOptions`, which got simplified
by this change.
This has few advantages:
* `Map` is more performant, and its keys cannot clash with builtin
JavaScript properties (e.g. `toString`).
* TypeScript has better type information about `map.keys()`, whereas
`Object.keys()` always return `string[]`.
Also, move `camelize` inside `getBooleanElements`, as it's only used
there, and unify the 2 `for` loops in `bindBooleanOptions` (iterating
`options` is wrong because it might contain options that doesn't exist
in the page).
relrelb