This adds a new fill mode last (last observation carried forward) for grafana
to the sql datasources. This fill mode will fill in the last seen value in a
series when a timepoint is missing or NULL if no value for that series has
been seen yet.

[skip ci]

Add auto_assign_org_id to defaults.ini

For #12801

[skip ci]

[skip ci]

remove alias from postgres $__timeGroup macro

add $__timeGroupAlias macro to all sql datasources

table link color fix

[skip ci]

Add new Redshift metrics and dimensions for Cloudwatch datasource

 AWS/Redshift has new dimensions (`latency`, `service class`, `wmlid`) and metrics (`QueriesCompletedPerSecond`, `QueryRuntimeBreakdown`, `QueryDuration`,  `WLMQueriesCompletedPerSecond`, `WLMQueryDuration`, `WLMQueueLength`) in Cloudwatch: https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/rs-metricscollected.html

[skip ci]

[skip ci]

* Improve iOS homescreen icon

* Improve Windows10 tile experience

* Remove unused favicon

* add series override option to hide tooltip

* fix test

* invert option

* fix test

* remove initialization

[skip ci]

fix custom variable quoting in sql* query interpolations

Karma to Jest: prometheus datasource

[skip ci]

Added BurstBalance metric to list of AWS RDS metrics.

[skip ci]

add AWS/DX metrics and dimension to cloudwatch