Fix parsing of user model if email is not present
Use user avatar hash instead of calculating it from the email
Format
Replace GravatarImageProvider
Set min sdk version to 19
Change target api version to 28
Limit drone pipeline execution to master or pr
Remove drone debug
Use username instead of id
Format
"Fix" clone permissions
Drone debug
Fix drone permissions with different flutter build docker image
Switch CI build image
Bump Gradle sdk version
Fix formatting
Update packages for support for androidX
Update gitignore
AndroidX
Make GravatarImageProvider work again
Co-authored-by: kolaente <k@knt.li>
Reviewed-on: vikunja/app#38
