* embed mode: make embedding options more extensible
ui: unify service worker not available errors, show same error in standard/embed mode, including when loaded over http
- more customizations for extended embed, allow hiding 'browse contents' button
- simplify title updates
- make error page / icon more customizable
- autoupdating in editable mode: don't update if previous one didn't finish, make customizable, don't autoupdate at all over >=100 pages
* dependencies: update ruffle to 2022-07-02
* bump to 1.6.1, update CHANGELIST
ruffle: support for ruffle for flash loading, both hosted and in app
electron: update to latest beta (14) for latest chromium version
embed error messages: better error message when service worker can not be found
electron: build universal app for osx
bump to 1.5.0!