Revert "Use "radio button"-like UI to switch between Map 1, Map 2, and Split Screen"

This reverts commit b06a534c2971dd060f412ca1a466091af5bdd672.
===
The client didn't like the implementation as it required too much screen
real estate.

Conflicts:

	src/GeositeFramework/css/app.css
Add descriptive elements to map switcher

Now is more explicit.  Reads "Switch to <<other map #>>" and the
icon show the current map number.  Tooltip also updated to be
more explicit about the current state and what the action will do.
TNC users found this confusing, but didn't like the radio-button
solution.