* Add options for searchTerms and searchKanji
* Add settings HTML
* Add options to TextScanner
* Update _search/_findDefinitions to include searchTerms/searchKanji args
* Update _searchAtFromMouseMove args
* Change argument structure for _searchAt
* Use scanning options for searchTerms and searchKanji
* Add options for scanning input types
* Move buttons in layout, refactor CSS
* Add options for input types
* Use input type filters
* Add _getMatchingInputGroupFromEvent
* Use input filters for touch events
* Add inputs to options.scanning
* Update CSS for mouse buttons
* Update list counters
* Set up HTML/CSS
* Add input controller
* Use new inputs
* Include mouse buttons
* Update how button inputs are detected
* Add index/empty fields to the input details object
* Update none check for scanning modifier
* Remove old settings
* Remove unused global
* Add hideDelay option
* Add _clearSelection
* Use hideDelay
* Prevent repeated delayed selection clears
* Fix popup hide timer being cleared when the cursor is moved into the frame
* Add support for injecting stylesheets into a custom parent node
* Add api.getStylesheetContent
* Add support for injecting a CSS file's content
* Add usePopupShadowDom option
* Use a per-parentNode cache
* Add support for using a shadow DOM wrapper around popup iframes
* Ignore the popup container instead of the frame