vaadin/flow 9.0.0.alpha5 on GitHub

Vaadin Flow 9.0.0.alpha5

Breaking Changes:
- ⧉ Deprecate methods in AppShellSettings that require UI. PR:11800
  There are some methods on AppShellSettings that only work with legacy bootstrapping, marked those as deprecated, and throw unsupported exceptions to not confuse users.
New Features:
- ⧉ Allow listener removal via DataChangeEvent. PR:11849. Ticket:6947
Fixes:
- ⧉ Handle an extra spaces in class names properly. PR:11861. Ticket:11709
- ⧉ Implement toString, equals, hashCode for Key implementation used in "of". PR:11837. Tickets:8474, 4626
- ⧉ Add possibility to set header values for StreamResource. PR:11860. Ticket:5471
- ⧉ Add fusion csrf cookie to correct path. PR:11852
- ⧉ Use jdk8 compatible package.. PR:11855
  Some transitive packages that were in a defined range got released built on JDK11 instead of JDK8
- ⧉ Only write package.json if something actually changed. PR:11847. Ticket:11259
  Flag update of vaadin version as an addition also and only write the package.json if thee was an actual change in content.
- ⧉ Add equals and hashCode to SimpleResult. PR:11827. Ticket:10948
- ⧉ Make IPhone version above 14.7 browsers allowed for Vaadin. PR:11821. Ticket:11654
- ⧉ Downgrade to swagger-codegen-generators 1.0.20. PR:11812. Ticket:11806
⧉ All changes