After a refactoring the sidemenu-canvas css class disappeared so changed the code from #3741 to use the main-view class instead.

This change have caused alot of questions. So we revert

Reduce the amount of thresholds values to two in singlestat panel

closes #3248

and change to typescript

merge apiPlugins with appPlugins

Support OpenTSDB 2.2 fill policies, closes #3802

Fix dashboard sorting in playlists

add export to csv in table panel

ApiPlugin custom header support

The header content uses text/Template.  If the apiPlugin is
bundled in an App, then the appSettings.JsonData is passed
to the header template.

allow saving changes to appModel made by configView directive

configView directives can update the appModel object.  We need
a save button to persist the updates.