add sdk/(ui, content/mod, lang/functional, lang/type, places/bookmarks, places/favicon, places/history, stylesheet/style, stylesheet/utils, test/utils, ui/button/action, ui/button/toggle, ui/frame, ui/id, ui/sidebar, ui/toolbar, util/array, util/match-pattern, util/object); fix i18n of system/events, modularize possible privs where possible, +todo, style lists hack for Notepad custom lang++; content/symbiont and system/child_process prepped as apparently to be available as APIs, but not part of SDK 1.16