* removes readonly editor role
* adds viewersCanEdit setting
This enable you to allow viewers to edit/inspect
dashboards in grafana in their own browser without
allowing them to save dashboards
* remove read only editor option from all dropdowns
* migrates all read only viewers to viewers
* docs: replace readOnlyEditor with viewersCanEdit
* use utf8mb4 character set for connections to mysql
* use utf8mb4 character set for tables, shorten varchar fields used in unique indexes
* migration type to update table character set
* update table character sets
* set charset for temp_user.status
* gofmt
Carl Bergquist
Dan Cech
Torkel Ödegaard