Improvement to previous commit

Detail:
  s/Wimp04, s/Wimp10 - cachespritedata & cachetoolspritedata now force SpriteExtend to be used if the sprite has an alpha channel, to ensure plotting an alpha'd sprite into an alpha'd framebuffer performs blending instead of potentially skipping it (and copying the sprite alpha channel to the screen alpha channel)
Admin:
  Builds, but untested


Version 5.33. Retagged as 'Wimp-5_33'

s/Wimp04

@@ -3386,6 +3386,7 @@ cachespritedata
         ANDEQ   R1,R1,LR
         TEQEQ   R1,R2                   ; any colour space conversion or alpha blending needed?
         LDREQ   R1,sprite_lastmode
+        TSTEQ   R2,#ModeFlag_DataFormatSub_Alpha ; does it have an alpha channel?
         TSTEQ   R1,#&80000000           ; does it have an alpha mask?
         LDR     R1,sprite_log2bpp
         TEQEQ   R1,R6                   ; bpp differs?

s/Wimp10

@@ -3290,6 +3290,7 @@ cachetoolspritedata
         ANDEQ   R1,R1,LR
         TEQEQ   R1,R2                   ; any colour space conversion or alpha blending needed?
         LDREQ   R1,tsprite_lastmode
+        TSTEQ   R2,#ModeFlag_DataFormatSub_Alpha ; does it have an alpha channel?
         TSTEQ   R1,#&80000000           ; does it have an alpha mask?
         LDR     R1,tsprite_log2bpp
         TEQEQ   R1,R6                   ; bpp differs?