1.0.0-beta.71 Embed API and reworked actions

• Added embed extension to provide a communication with a host in case when an app is loaded into iframe
• Added embed support for preloader
• Added dist/discovery-embed-host.js into package, a ESM module which provides an API to communicate with an app loaded into a sandbox (iframe)
• Added setup() method for upload extension to specify custom settings
• Added #.actions.uploadFile.dragdrop to indicate drag&drop file supported or not (provided by upload extension)
• Added startLoadData, startSetData and unloadData events
• Added callAction(name, ...args, callback?) and actionHandler(name, ...args, callback?) jora helpers, the callback is applying to handle a result of an action call when specified
• Changed tooltip to use evaluated value instead of raw config value
• Changed Progressbar to be inherited from Publisher
• Replaced Widget#actions with Widget#action which is a dictionary, i.e. now available Widget#action.define(name, callback), Widget#action.revoke(name), Widget#action.call(name, ...args) and the rest methods of Dict (actions also available via #.actions in jora queries)
• Fixed markerAll() jora helper
• Fixed upload options setting
• Fixed applying twice the extensions passed via App's options
• Fixed suggestions for context value (#) in report's query editor
• Tweaked nested list styles in markdown view
• Removed obsoleted methods:
  • Widget#addEntityResolver()
  • Widget#addValueLinkResolver()
  • Widget#addBadge()
  • Widget#addQueryHelpers()