private ExtensionDetails getSelectedExtension(int row) {
		return getRowObject(row);
	}
Returns the selected extension.
<p>
Note that this table is single-selection only, so this will only
ever return 1 item.

@param row the selected row
@return the selected extension, or null if nothing is selected
Ghidra/Framework/Project/src/main/java/ghidra/framework/project/extensions/ExtensionTableModel.java