add support for multiple root folders, fix buttons in tab#2, save rootfolders to settings

Author: unitycoder

UnityLauncher/App.config

@@ -13,6 +13,14 @@
             <setting name="rootFolder" serializeAs="String">
                 <value>C:\Program Files\</value>
             </setting>
+            <setting name="rootFolders" serializeAs="Xml">
+                <value>
+                    <ArrayOfString xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                        xmlns:xsd="http://www.w3.org/2001/XMLSchema">
+                        <string>C:\Program Files\</string>
+                    </ArrayOfString>
+                </value>
+            </setting>
         </UnityLauncher.Properties.Settings>
     </userSettings>
 </configuration>