* get rough funcitonality working
* try to tidy up types
* fix merge error
* fix signature change error
* type wrangling
* use onBeforeInput listener
* add onBeforeInput handler, add logic to onPaste
* fix type error
* bring plain text listeners in line with useInputEventProcessor
* extract common function to util file, move tests
* tidy comment
* tidy comments
* fix typo
* add util tests
* add text paste test
