* Upgrade babel + plugins, use es2020 preset, move contour js and transpile it
* Reset js to master
* Fix contours name in webpack config
* Update contours w latest from master
* Galdernit
* Rebuild charting.js
* Upgrade nyc
* Require babel core in opts, not in config
* Add spaces when joining with AND, works right now but looks funky
* filter any non existent filters, fix indentation in example
* More careful filtering of filter transforms, only take the goodn's
* Add method to remove layer by name
* Add method to add layer to the bottom of the stack
* First draft polygons layer + lines layer
* Small adjustments to query to get it to work
* Add opacity for contour colors, change colors a bit
* Switch to suggested format
* Include popover stuff in the contour state
* Move interval settings to sub property, default field name for major/minor field, throw error if calling contour sql generate on a non contour layer
* Change field name to is* so that its more clear that its a boolean
* Add some basic validation, throw errors when things are bad, interval -> intervals
* First draft polygons layer + lines layer
* Small adjustments to query to get it to work
* Add opacity for contour colors, change colors a bit
* Formatting
* Fix lint problems and bug created when refactoring
* Move default opacity to constant, use throughout
* Add validation check for table before generating preflight query. Reject promise if not
* Spiff up check, used extracted data const, formatting
