Add 4k and 64k new sprite selector
Detail: Put in minimal support to create 4k and 64k sprites (currently, TBGR only) so that the User Guide chapter makes sense. Previously it was only possible to create such sprites by switching to that mode and doing a screen capture. Admin: Tested on RISC OS 4.02 (ie. without 4k & 64k support) and RISC OS 5.23 (ie. with). Version 2.22. Tagged as 'Paint-2_22'
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