Slacken pointer checks
The pointer comparison checking required when running in a system with > 64M memory was tightened up from Wimp-4_75 to Wimp-4_76, but to allow the module to target pre RISC OS 5 systems an option to relax those checks is required. Each check has been revisited and where appropriate demarked with a "AcceptLoosePointer" macro, which just remaps the pointer into the stricter form and carries on. In the strict checking case, the macro reduces to nothing. Detail: Add AcceptLoosePointers switch. Retire singular use of StrongARM switch (calling XOS_SynchroniseCodeAreas is harmless pre StrongARM anyway). Rename Ursula_RPC options to RO400. Put duplicate documentation in the attic. Allow -2 or -1 as the iconbar handle in Wimp_ResizeIcon (ticket #203). Tighten up the list terminator check in the DebugMemory switch of Memory.s Tested on RISC OS 3.10 (emulated), 3.50, 3.60, 3.70, 4.02. Version 5.24. Tagged as 'Wimp-5_24'
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