* Explore: Allow the use of plugin panels
Allow plugins to define a visualisation to use in explore that comes from a plugin.
* Explore: Allow the use of plugin panels
Rename ExplorePanel to CustomContainer
* Explore: Allow the use of plugin panels
Changed CustomContainer to take all frames for plugin id.
Add field preferredVisualisationPluginId to frame metadata.
Updated decorators to check for plugin and fallback to preferredVisualisationType if plugin cannot be found.
* Explore: Allow the use of plugin panels
Handle case where there are no custom frames
* Explore: Allow the use of plugin panels
Add test cases