Our files are up to a decade old, and have churned so much, that the initial author of the file no longer has much meaning.
Furthermore, this will encourage developers to post to the developer group, rather than emailing Googlers (usually me) directly.
* Add annotations to files under core/events
* Add annotations to files under core/interfaces
* Add annotations to files under core/keyboard_nav
* Add annotations to files under core/renderers
* Add annotations to files under core/serialization
* Add annotations to files under core/theme
* Add annotations to files under core/toolbox
* Add annotations to files under core/utils
* Add annotations to files under core
* chore: named export for block.js
* chore: named export for block_drag_surface.js
* chore: named export for block_dragger.js
* chore: named export for block_svg.js
* Fix import ordering
* chore: fix imports using requireType
* Remove extra require
* Migrate core/events/events_block_drag.js to ES6 const/let
* Migrate core/events/events_block_drag.js to goog.module
* Migrate core/events/events_block_drag.js to named requires
* clang-format core/events/events_block_drag.js