Tusky 19.0

- Support for Unified Push. To activate the support you will have to relogin into your accounts.
- The number of responses to a post is now indicated in timelines.
- Images can now by cropped while composing a post.
- Profiles now show the date when they were created.
- When viewing a list the title is now displayed in the toolbar.
- A lot of bugfixes
- Translation improvements
