Fixed issues with plus button in threshold and panel option header

support three letter hex color strings

Fixed issues with plus button in threshold and panel option header, and current state in viz picker, fixes #15329

mark grafana-ui package with Apache license

POC - Enable js defined theme to be used in SASS

IPA v4.6.4 introduced a fix that does not allow empty attributes
to be sent in a search request. This fix only adds attributes to
the request if they are mapped in the ldap toml file.

fixed explore width-0 issue

Auth token package and middleware refactoring

Dashboard react page

Unexpected semver comparison behavior #15280

support json format templating

Remove react-sizeme and use AutoSizer

better ha setup for many mysql connections
prometheus now scrapes mysql metrics in ha setup
ha setup provisions mysql dashboard
adds configurable virtual users for load test run script

Removed unused theme variables