Build "edit" page

[tomzemp]

Work on building page for this:

-Convert map properties to Chip "Headers" in side bar (with handlers for add/delete)
-In main space, have parsed questionnaire with links to map's headers/properties
-For initial stage, probably have question use a select of the available headers/properties from the map
-api calls to back-end to update map as user makes changes

[tomzemp]

Need to decide how to handle this...trying to pass map/parsed questionnaire as props from UpdateMap component, which redirects based on whether you are in edit/upload mode. However, passing props to be used as state is a bit buggy (https://reactjs.org/blog/2018/06/07/you-probably-dont-need-derived-state.html) and seems not to work as well as the older 16.3 and earlier version of componentWillReceiveProps...could redo to retrieve map/parse within the specific edit/upload

[tomzemp]

Decided to pull map/questionnaire set state at lower level component to get around issue mentioned above (#24 (comment)) ... considered Redux but probably not necessary, code can be reused as service within MapUpload and MapEdit components, but could probably be improved further

[tomzemp]

Next steps:

• build handler on selects (i.e. need to update map based on what is selected (and set value on select))
• check names of new headers for "validity"
• push back update map to back end