Release 2.20.0

[Khaoz-Topsy]

Prepare:

• [x] Make sure that pubspec.yaml uses github link for the assistantapps_flutter_common library
• [x] Regenerate AssistantApps server data from the AssistantNMS.Data tool
• [x] Verify that AssistantNMS.Data audits have all passed
• [x] Make sure content of release_notes.txt is ready for production
• [x] Run the versionNumberScript dart scripts\version_num_script.dart
• [x] Create new item in Admin tool
  • [x] Copy content of release_notes.txt to Markdown
  • [x] Future date release date
  • [x] Copy guid, paste into assistant_apps_settings.dart
• [x] Create Pull Request
• [x] Queue CodeMagic build

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Later:

• [x] Merge Pull Request on successful build and deploy
• [x] Create Github release (New Release)
  • [x] Tag develop branch (2.x.x)
  • [x] Use appropriate tag (2.x.x)
  • [x] Attach .aab
  • [x] Attach .apk
  • [x] Attach .ipa
  • [x] Attach .exe
• [x] Go through manual iOS steps
  • [x] Copy content of release_notes.txt into Apple webpage
  • [x] Submit for Apple review
• [ ] Go through manual WindowsStore steps
  • [ ] Copy content of release_notes.txt into store webpage
  • [ ] Submit for Microsoft review