* Small improvements

* Better error handling

* Use xerrors instead of pkg/errors

* Add Wrap util func

* Move Wrap to errutil package

* Chore: use early return technic everywhere

And enable "indent-error-flow" revive rule

* Chore: remove if-return rule from revive config

* Chore: improve error messages

And enable "error-strings" revive rule

* Chore: enable "error-naming" revive rule

* Chore: make linter happy

* Chore: do not duplicate gofmt execution

* Chore: make linter happy

* Chore: address the pull review comments

* Update notifications.md

* Update notification services docs

* Chore: remove session storage references

* Small refactoring of the settings module

* Update docs - remove references for the session storage

* Update config files (sample and default configs)

* Add tests for warning during the config load on defined storage cache

* Remove all references to session storage

* Remove macaron session dependency

* Remove leftovers

* Fix: address review comments

* Fix: remove old deps

* Fix: add skipStaticRootValidation = true to tests

* Fix: improve the docs and warning message

As per discussion in here - https://github.com/grafana/grafana/pull/16445/files#r273026255

* Chore: make linter happy

Fixes #16148
Ref #16114

* removed settings header in aside, added header next to search button, tweaked paddings

* Minor tweak

* Do not override default `hide` value of variables

Some variables like `constant` are configured to
be hidden by default and this setting must be
treated with respect.

* make textBox variable visible by default

Fixes #16695

* check for running

* split out panel state

* adding test file

* remove bad test

Fixes #1690 

navigation between pages in app plugin is slow, due to use of non angular native promise

Fixes #16672

merged DataQueryOptions + DataRequestInfo info: DataQueryRequest

* move queryRunner to panelModel
* Added interval back as prop, not used yet
* PanelQueryRunner: Refactoring, added getQueryRunner to PanelModel
* PanelQueryRunner: interpolatel min interval

* Docs: initial backend plugins development guide

* Some tweaks

* more tweaks

* chore: docs changes to backend plugins guide

* chore: docs tweaks to backend plugins guide

* use timeInfo from request

* move timeInfo to DataRequestInfo

* move queryRunner to panelModel

* remove isEditing from PanelChrome

* move listener to QueriesTab

* Fixed issue with isFirstLoad set to false before loading state is Done

* QueryRunner: Fixed issue with error and delayed loading state indication

* Anoter fix to issues with multiple setState calls in observable callbacks

Moves query execution logic to PanelQueryRunner and structures PanelChrome so it subscribes to the query results rather than necessarily controlling their execution.

The iteration order over maps is not specified and is not guaranteed
to be the same from one iteration to the next. If a map entry that
has not yet been reached is removed during iteration, the corresponding
iteration value will not be produced. If a map entry is created during
iteration, that entry may be produced during the iteration or may be skipped.
The choice may vary for each entry created and from one iteration to
the next. If the map is nil, the number of iterations is 0.

https://golang.org/ref/spec#For_range

* removed unsused grafana-icon classes, replaced grafana-icons with gicons

* replaced old dashboard and datasource icons with gicon, fixed so icons on plugin list are shown

* removed unsused grafana-icon classes, replaced grafana-icons with gicons

* replaced old dashboard and datasource icons with gicon, fixed so icons on plugin list are shown

* replaced fontawesome cog, eye, link and edit with gicons

* updated snapshot

* fixed color of cog in dashboard nav, removed icons from buttons, ran preitterier on some files

* changed opacity on getting started icons and fixed getting started button

* .5 -> 0.5 fix for prettier

* Search: Fixes search limits and adds a page parameter

This adds a page parameter to search api without adding
any major breaking change.

It does at an api validation error when trying to use
a limit beyond 5000. This is a breaking change. We could
remove this and have it only in the docs and describe that this
is a limit that grafana will apply silently.

Fixes #16049

* Fix: Corrected wrong array slice change

* Docs: minor docs fix

* Search: fixed folder tests

* Fixed: Moved limit to correct inner query

* Search: moving limit check and page check

* Search: limit in handler is no longer needed

* fix: Lock version of dependencies

* fix: Lock version of devDependencies

* fix: Lock down grafana/ui npm versions + regenerate lockfile

* fix: Back some versions i tried to bump

* fix: Bump react and react-dom to latest

* chore: Remove types/react from resolutions

* fix: Lock eventemitter3 version in package.json

bmizerany is old and unsupported. so we are replacing it
with stretchr which is an drop in replacement and something
we want to use more in Grafana.

* pass query request/response to panel plugins

* rename finishTime to endTime

* move QueryResponseData to a sub variable

* rename to PanelData

* make data not optional

* make data not optional

* missing optional

Fixes: #16277

* Chore: refactor auth proxy

Introduced the helper struct for auth_proxy middleware.
Added couple unit-tests, but it seems "integration" tests already cover
most of the code paths.

Although it might be good idea to test every bit of it, hm.
Haven't refactored the extraction of the header logic that much

Fixes #16147

* Fix: make linters happy