Menu bugfixes and sprite variation support.
Detail: * Adjust clicking on menu items was leading to Message_MenusDeleted being broadcast, resulting in incorrect behaviour in many applications. * Sprite-only menu items (eg !Draw's line pattern submenu) now highlight correctly when tiled menus are configured. * Added Wimp_Extend 13, which works out the appropriate resolution suffix for a given sprite pathname - required since Sprites11 support needs an iterative approach. This supercedes Wimp_ReadSysInfo 2. * *IconSprites now tries prefixing the last element of its path argument with "<Wimp$IconTheme>". Admin: Tested on Tungsten. Version 4.85. Tagged as 'Wimp-4_85'
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