Clear graphics on shape type select.

Closes #62

Standardized MapController topics.
Reset/clear previous search panes and associated graphics on switch.

Closes #65
City search graphic now uses maps default graphics layer and persists after map nav.
Clear Parameters button now clears all search parameters and selected query layers.

Moved search buttons and error messages outside of "Define Search Criteria" pane.

Closes #64
Removed errant agrc submodule
Merge pull request #94 from agrc/clear

Clear search stuff