Prevents paint_count values from being skewed when hiding windows.

rpcrt4: RPCRT4_strdupWtoA and RPCRT4_strdupAtoW don't change the input string, so make the input const.

rpcrt4: Stash away NetworkOptions passed in from the binding string so that transports can look at the string if needed.

riched20: Create undos in StreamIn at the right times. Adds tests for when StreamIn should be undoable.

This fixes a winapi_check warning.