I renamed `tlsAuth` to `tlsClientAuth` to better describe the fact that
this variable is used to enable TLS client authentication (as opposed to
server authentication) in c04d95f35.

However, changing the name breaks backwards compatibility for existing
installations using this feature and Grafana does not have a
standardised way of migrating changes in the schema:
https://github.com/grafana/grafana/pull/9377#issuecomment-333063543

For reasons of expediency given the severity of the bug (not verifying
TLS), keep the old name.

It's an acronym, so it should be all caps.

In c04d95f35 I changed the default for datasource HTTP requests so that
TLS is always verified.

This commit adds a checkbox to allow an admin to explicitly skip TLS
verification, for testing purposes.

URL is an acronym, it should be all caps.

...to make this file compatible with goimports:
https://godoc.org/golang.org/x/tools/cmd/goimports

adding support for token-based slack file.upload API call for posting images to slack

* colorpicker: initial picker with predefined palette and spectrum

* colorpicker: highlight selected color

* colorpicker: add onChange() callback

* colorpicker: replace singlestat picker by new one

* colorpicker: style tweak

* colorpicker: parse color on input blur

* colorpicker: sort palette by hue and lightness

* colorpicker: refactor, move colors sorting to 'app/core/utils/colors'

* tech: colorpicker - fix linter errors

* colorpicker: convert to React components

* colorpicker: fix spectrum import after moving to webpack

* colorpicker: minor refactor

* colorpicker: initial series color picker

* colorpicker: fix tests error

* styling changes and some text changes

* styling changes

* fixing checkboxes

* deleted old file, fixed checkboxes

* minor change

redesigned dashboard links settingd, fixed a misspelling in rows and added fixed width to buttons (#9397)