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).

Only support the SYSTEM_MEDIA_TIME for now.

If the buffer is created and stopped, the contents of the buffer are
indeterminate, by zeroing it you won't get leftovers from last play.

Use the fallback system IReferenceClock, unless the app comes up with
its own clock.