added two new variables in default theme for panel padding, replaced panelhorizontalpadding and variables.panelverticalpadding with new variables

8px system margins

Heatmap: Fixes Y-axis tick labels being in wrong order for some Prometheus queries

Multi valued datasource variable

heatmap: able to hide buckets with zero value

Remove deprecated kbn test

Call ora instead of instantiating it

Add a basic table editor to grafana/ui

rename handleXXX to onXX events

- Set container width to 100% so column widths can be calculated properly
- Sets duplicates, level, timestamp, local time to a fixed width based upon em units since the size of these are static
- Sets labels to be 20%
- Remove min-width:80% on message column so that it now consumes remaining space
- Additionally fixes long labels from overflowing into the messages column by properly setting a max-width per label and hiding overflow

closes #15673

Signed-off-by: Steven Sheehy <ssheehy@firescope.com>

Merge branch 'multiselect-repeatby-datasource' of https://github.com/jdoupe/grafana into jdoupe-multiselect-repeatby-datasource

Logo takes you Home instead of toggling side menu #15482

chore: Move sidemenu out of context service and use the logic we have in the router already for hiding the sidemenu

Styling update to fonts

The log rows were mutated in the store, what resulted in wrong deduplication results as well as made the selector memoization quirky - for "the same results" the selector was running twice. 

added new space variables to margins in AddPanelWidget, add_data_source, dashboard_settings and sidemenu

Fix: #14706 Incorrect index pattern padding in alerting queries

Revert "Fix Datasource Update to no User/Password"

Fixed alias in Cloudwatch Expressions

fix imageurl in notification test

skip unnecessary http -> https redirect, which could make problems on some notifiers

move stringToJsRegex to grafana/ui

Minor storybook cleanup

- DeleteButton should use withCenteredStory like everythign else
- Clicking the 'Red' button should not pick blue :)

docs: update slack alert notification settings