ContextMenu Support!

LLContextMenu functionality pulled out of LLPieMenu, PieMenu is now derived from LLContextMenu
- The more attribute boolean of pie_menu element determines whether or not to have an actual submenu if it's not a pie, defaults to false which means actual submenu..
-- in the future we may want to have more more="true" depending on feedback
- Pie menu labels now dynamically get " >" appended to them (avoids stupid looking context menus)
- Positioning logic combined in part, mostly conditional still, in the future we could probably combine it more.
- handleHoverOver function combines common functionality between context and pies given an item and hover mouse coords.

LiruUseContextMenus debug setting determines which to use, default is pie, of course
- Context(/Pie) Menus are rebuilt when the setting changes value
-- this is safe at any point because all startup states have been accounted for
- "Use context menus instead of pie menus" added to System->General preferences (it's close to the bottom)

indra/newview/skins/default/xui/de/menu_pie_attachment.xml

@@ -5,8 +5,8 @@
 	<menu_item_call label="Berühren" name="Attachment Object Touch"/>
 	<menu_item_call label="Aufstehen" name="Stand Up"/>
 	<menu_item_call label="Abnehmen" name="Detach"/>
-	<pie_menu label="Werkzeuge &gt;" name="Tools &gt;">
-        <pie_menu label="Skripte &gt;" name="ScriptsMenu">
+	<pie_menu label="Werkzeuge" name="Tools">
+        <pie_menu label="Skripte" name="ScriptsMenu">
           <menu_item_call label="Erzeuge Mono" name="CompileMono"/>
           <menu_item_call label="Erzeuge LSL" name="CompileLSL"/>
           <menu_item_call label="Zurücksetzen" name="Reset Scripts"/>