Allow non admins to see plugins list but only with readme. Any config tabs are hidden from the plugin page. Also plugin panel does not show action buttons (like Enable) for non admins.
Access is restricted via not showing in the following places:
* hide from sidemenu
* hide from panel header menu
* disable keybinding `x`
Also adds a `roles` property to reactContainer routes that will be
checked if `roles` is set, and on failure redirects to `/`.
* panel container menu gets new Explore entry (between Edit and Share)
* entry only shows if datasource has `supportsExplore` set to true (set
for Prometheus only for now)
* click on Explore entry changes url to `/explore/state` via location provider
* `state` is a JSON representation of the panel queries
* datasources implement `getExploreState()` how to turn a panel config into explore initial
state
* Explore can parse the state and initialize its query expressions
* ReactContainer now forwards route parameters as props to component
* `pluginlist` and `singlestat` panel subclasses needed to be adapted because
`panel_ctrl` now has the location provider as a property already
* mobx: poc in using each store as individual prop on the react containers
* prettier test
* fix: end the war between prettier vs tslint.
* mobx: Move stores into their own folders
* mobx: Refactor the AlertRule into its own file and add a helper-file
* mobx: Move NavItem out of NavStore and remove lodash dependancy
* mobx: Move ResultItem and SearchResultSection models out of the SearchStore
* mobx: ServerStatsStore rename .tsx => .ts. And move ServerStat-model to its own file.
* mobx: Remove lodash and jquery dependancy from ViewStore
* mobx: Remove issue with double question mark
