Closes #10957. Backslash escaping was already implemented on the
frontend but does not work for queries executed on the backend.

Fix broken markdown links in CHANGELOG.md

ref #10931

This reverts commit 47e363ea.

* added var to check if modal is open and an if for escape fullview

* moved showconfirmmodal to utils, showconfirmmodal now uses showmodal, esc works in textinput

* made esc global

Minor typo fix

So that the readme's can be published on Grafana.com

closes #10829

dashboard: whitelist allowed chars for uid