wininet: The lpszLocalFileName parameter to CommitUrlCacheEntryA is optional, so check before converting it from Unicode to ANSI.

Correctly initialized parameters to GetDIBits (based on
GdipLockBitmapBits).

richedit: In RTF reader, set both bold and weight attributes, so that we don't care about priority between the two.

richedit: Pass left margin around when computing the size of a run, so that a tab will get a correct size.

richedit: Store shift-enter (keyboard) and \line (rtf) as end of row (and emit \line while saving in RTF).

wined3d: Check the texture capabilities we offer for the different texture types (cube, plain, volume).