Fix a byte vs. WCHAR count issue in test_hkey_main_Value_W().
Check that RegQueryValueEx[AW]() did not write more data than expected.

REG_EXPAND_SZ must be exported as hexadecimal to preserve the string type.
0-byte strings and those missing a trailing '\0' or with odd sizes must 
be saved as hexadecimal too so they are restored as is.
Move the binary-value export code to the new REGPROC_export_binary() 
function.

We already know it in the caller so this saves us one lstrlenW() call.

This fixes a major buffer overflow bug in 'regedit /E'.

Get rid of most of the macros that make it hard to handle special cases.

This reflects the fact that they describe the fragment pipeline.
The vertex pipeline will use its own structures.

Add a test that checks what happens if D3DRS_POINTSIZE, D3DRS_POINTSIZE_MIN
and POINTSIZE_MAX have conflicting values. D3DRS_POINTSIZE_MAX trumps
D3DRS_POINTSIZE_MIN, and both MIN and MAX clamp the D3DRS_POINTSIZE value if it is
outside of their range.