Remove MapView/MapViewController

MapView replaced with a WebView.  No functions, yet.   Code that referenced the MapView/MapViewController commented out for now.
Prepare for error notification on image back-up.

A slight restructure for now.  I believe this to be more correct.
Display map at startup, wire up map type buttons

The map location/style is currently hard coded.  That will change next commit.
Save map location/zoom upon request; init from saved values

Use webView:didClearWindowObject:forFrame to load saved values after the web page is loaded but before it is displayed.
Listeners track location and zoom levels.   Zoom is jerkey when using pad gestures.   Don't know why.
Refactor some common code

Only need to convert a segmented control segment number into a google MapTypeId in one place.
Map support using a webview seems to be working

More testing is needed.