Improved notifications

[TheOneRing]

• Improve existing notification wording
• Use more notifications
• Add actions buttons to the Mac and Linux notification implementation
• Implement Windows Toast notifications
• Implement fallback solution

Related

• [OS X?] Use more "persistent" desktop notifications for certain events #4697
• [Notifications] Include reciever for federated sharing notifications  #4802
• Balloon notifications should open the directory the file was put in by clicking on them #4841
• [Notifications] Group similar notifications received together instead of showing them in batch #5493
• [Notifications] Include the account URL (and username) on each #5587
• [Notifications] Ability to control types of enabled desktop notifications #6443
• Windows specific
  • Show client notifications in windows 10 info-center #3725
• macOS specific
  • [Mac OS X] desktop notification: better use "Alerts" if user interaction is required #4410
• Also check
  • [Notifications] Notifications that require acceptance should send an update status to clients in case of being updated at server directly #4787 (server involved?)

[TheOneRing]

@michaelstingl @guruz what do you think?

[guruz]

Feel free to do it :-)

Please also check if you can assign yourself individual existing issues instead https://github.com/owncloud/client/search?q=notifications&state=open&type=Issues