* Relocate chart type and dataset type defaults
* Update types
* Separate overrides and descriptors
* Update derived sample, use merge for inherit
* Don't merge overrides
* Review update
* fixed fill for area chart stacked and title for charts where it wasn't in plugins yet
* Chart defined in utils
* added radar skip points example in the overview to go to
#7409 Legend callbacks support arrow functions
The `Legend` is no longer implicitly found through `this` and instead
passed as an explicit argument to the callback functions.