Satisfy Issue 904: Add option to close appearance floater with Esc

Setting AppearanceCloseOnEscape to true will turn this on.

indra/newview/app_settings/settings.xml

@@ -2127,6 +2127,17 @@ This should be as low as possible, but too low may break functionality</string>
       <key>Value</key>
       <integer>1</integer>
     </map>
+    <key>AppearanceCloseOnEscape</key>
+    <map>
+      <key>Comment</key>
+      <string>When in appearance editing mode, hitting escape will work the same as the close button</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <integer>0</integer>
+    </map>
     <key>AppearanceSpecialLighting</key>
     <map>
       <key>Comment</key>

indra/newview/llmorphview.cpp

@@ -132,6 +132,8 @@ void LLMorphView::setVisible(BOOL visible)
 		}
 		else
 		{
+			if (LLFloaterCustomize::instanceExists() && gSavedSettings.getBOOL("AppearanceCloseOnEscape"))
+				LLFloaterCustomize::instance().onClose(false);
 			shutdown();
 		}
 	}