* Move "yomichan" object setup to a separate file
* Update script imports
* Align message handlers
* Rename Yomichan.prepare to Yomichan.ready
* Add new prepare function
* Improve isExtensionUrl
* Update test
* Rename db to _db
* Create GenericDatabase class
* Catch prepare error
* Allow database to be purged even if it was not open
* Remove unused functions
* Change static functions to non-static
* Delete and count using the media object store
* Update tests
* Convert handlebars.js to a class
* Move/rename function
* Update helper registration
* Rename helper functions
* Limit cache size
* Make render() async
* Rename and move
* Use new CrossFrameAPI for popup proxy communication
* Remove use of old cross-frame communication classes
* Remove use of old cross-frame communication files
* Make the crossFrame object a member of the api object
* wip
* add environment class
* use Environment class
* use Environment for scanning modifier options
* remove Environment in favor of API
* await promise
* use modifier symbols on macOS
* fix key separator issues
* if else to switch
* simplify variable names
* Convert mixed japanese.js to utility class
* Copy functions from bg/js/japanese.js into mixed/js/japanese.js
* Remove bg/js/japanese.js
* Make wanakana dependency optional
* Update tests
* Update getProfile/getProfileFromContext to store this.options in a variable
* Add useSchema parameter to options getter functions
* Add apiModifySettings
* Use apiModifySettings instead of apiOptionsSet
* Remove apiOptionsSet
* Fix incorrect deleteCount check
* Require explicit scope for options
* Throw on invalid scope
