* Remove unused ignoreSelectors
* Remove unused isMouseButtonPressed
* Update getWritingMode to use the immediate element if possible
* Move static functions to DocumentUtil
* Fix documentation
* Move TextSourceRange static functions to DocumentUtil
getWritingMode is also simplified
* Update Google Docs range to be empty to match other range sources
* Rename imposterContainer to imposterElement
* Add static creation functions
* Add static creation function
* Remove unused collapse function
* Don't select imposter elements
* Refactor setEndOffset
* Adjust argument order for setEndOffset
* Update TextSourceRange constructor
* Remove unused isConnected
* Cache rects
* Fix test
* Remove unused getRect
* Revert "Fix test"
* Remove cachedRect
* Use the source element rect to handle scroll differences
* Writing mode update
* Remove _cachedRects update
This shouldn't be necessary as the imposter is usually detached
almost immediately after scanning, giving no time for the window
to be resized or scrolled.
* Make all methods static
The two non-static methods are kept for temporary compatibility
* Use this instead of class name now that functions are static
* Update test
* Don't instantiate DocumentUtil
* Remove temporary non-static methods
* Remove unused global declaration
* Move comment
* Add DocumentUtil.isInputElement
* Use DocumentUtil.isInputElement
* Fix simple hotkeys (shift or no modifier) preventing text field input
* Improve input detection
* Validate key is an input character before blocking hotkey
* Simplify
* Fix incorrect property
* Move mixed/js/core.js to js/core.js
* Move mixed/js/yomichan.js to js/yomichan.js
* Move mixed/js/timer.js to js/debug/timer.js
* Move mixed/js/hotkey-handler.js to js/input/hotkey-handler.js
* Move mixed/js/hotkey-help-controller.js to js/input/hotkey-help-controller.js
* Move mixed/js/hotkey-util.js to js/input/hotkey-util.js
* Move mixed/js/audio-system.js to js/input/audio-system.js
* Move mixed/js/media-loader.js to js/input/media-loader.js
* Move mixed/js/text-to-speech-audio.js to js/input/text-to-speech-audio.js
* Move mixed/js/comm.js to js/comm/cross-frame-api.js
* Move mixed/js/api.js to js/comm/api.js
* Move mixed/js/frame-client.js to js/comm/frame-client.js
* Move mixed/js/frame-endpoint.js to js/comm/frame-endpoint.js
* Move mixed/js/display.js to js/display/display.js
* Move mixed/js/display-audio.js to js/display/display-audio.js
* Move mixed/js/display-generator.js to js/display/display-generator.js
* Move mixed/js/display-history.js to js/display/display-history.js
* Move mixed/js/display-notification.js to js/display/display-notification.js
* Move mixed/js/display-profile-selection.js to js/display/display-profile-selection.js
* Move mixed/js/japanese.js to js/language/japanese-util.js
* Move mixed/js/dictionary-data-util.js to js/language/dictionary-data-util.js
* Move mixed/js/document-focus-controller.js to js/dom/document-focus-controller.js
* Move mixed/js/document-util.js to js/dom/document-util.js
* Move mixed/js/dom-data-binder.js to js/dom/dom-data-binder.js
* Move mixed/js/html-template-collection.js to js/dom/html-template-collection.js
* Move mixed/js/panel-element.js to js/dom/panel-element.js
* Move mixed/js/popup-menu.js to js/dom/popup-menu.js
* Move mixed/js/selector-observer.js to js/dom/selector-observer.js
* Move mixed/js/scroll.js to js/dom/window-scroll.js
* Move mixed/js/text-scanner.js to js/language/text-scanner.js
* Move mixed/js/cache-map.js to js/general/cache-map.js
* Move mixed/js/object-property-accessor.js to js/general/object-property-accessor.js
* Move mixed/js/task-accumulator.js to js/general/task-accumulator.js
* Move mixed/js/environment.js to js/background/environment.js
* Move mixed/js/dynamic-loader.js to js/scripting/dynamic-loader.js
* Move mixed/js/dynamic-loader-sentinel.js to js/scripting/dynamic-loader-sentinel.js
