karma to jest: exporter, playlist_edit_ctrl

Expose react and slate to external plugins

dsproxy: allow multiple access tokens per datasource

fix panel link icon positioning

After refactoring to be able to mock the client in
a test, the client wasn't a global variable anymore.
This change moves the client back to being a package-
level variable.

Experimental support for react in external plugins

- react
- slate (editor)
- papaparse (csv parsing)
- prismjs (syntax highlighting)

This is needed for new external datasource plugins like Flux

Convert tests from Karma to Jest

autoFocus the add-panel search filter, and add on enter

[skip ci]

Import dashboard to folder

Update "Building from source" docs

removed QueryOptionsCtrl references

docs: correct provisioning link

It was pointing to Prometheus documentation instead.

Changes the cache key for tokens to cache on datasource id +
route path + http method instead of just datasource id.

Karma to Jest: graph-tooltip

[skip ci]

Disable save dashboard button when saving

Upgrade mattn/go-sqlite3 to v1.7.0

Propagate specific git-sha into tarball and docker builds

changed som variables to values so it's the same for dark and light theme, added special styling for login text, link and input (#12196)