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Refactor test to use SETCLIPBOARDATA from the DLLCALL samples

Add a DLLCALL sample for SetClipboardData()

Port BITSIZE to use wxWidgets for everything except BITINDEX 0.
This makes BITSIZE available on GNU/Linux platforms.

Add missing regression tests for BITSIZE

Stop DLLCALL from truncating "U" parameters at the first NUL for word inputs.
This enables a clever caller to pass arbitrary binary data.
The motivation for this is to be able to call ::SetClipboardData with a bitmap for the purpose of testing BITSIZE when BITINDEX=0.

Update DUMPBIN to describe the "ascii" value as a code point.
This is technically more accurate since the input could contain arbitrary Unicode characters.

Add a few more backward-compatibility tests for DLLCALL.
(strtod and atoi only check the prefix)

Update the patch for imagbmp.cpp to be what I submitted to the wxWidgets master.
This doesn't use exceptions but instead tests that biClrUsed is in a reasonable range.

Cleanup: Remove some unused variables

Reduce the size of the back buffer that is used to remove flicker when using rotating bitmapped turtles.
Instead of being the size of the drawing surface, it's now just enough of the drawing surface needed to be able to draw the screen.