Improved onboarding flow (version 1)

• Open app settings on recent version of android (fixes e-mission/e-mission-docs#608)
• Open app settings on recent version of iOS (improves on e-mission/e-mission-docs#483 by not relying only on documentation)
• Refactor iOS onboarding to check for more conditions and handle them through popup redirects
• Notification text improvements - making them more humanized and opening the door for i18n
  e-mission/e-mission-data-collection#192
  e-mission/e-mission-data-collection#191
  e-mission/e-mission-data-collection#190

Minor fixes to other plugins: null check and motion activity refactoring
e-mission/cordova-jwt-auth#44
e-mission/cordova-server-sync#48