Don't allocate memory for the thread error structure until it is
needed, as it is quite large and wastes memory for threads that don't
call any wininet function.

Free all pointers by default, except for conformant strings.
Conformant arrays should always be freed.
Add FC_CVARRAY to list of known types to avoid a FIXME.

Use the documented NDR_PROC_HEADER_EXTS structure instead of the
current NDR_PROC_EXTENSIONS structure currently in ndr_stubless.c.

Store the return value on the stack for stubs, as MIDL reserves space
for it and gives us a stack offset. This fixes calling methods with
thunks that assume that the return value will be stored on the stack.

Correctly fill in StackTop for stubless clients/servers so that
conformance for top-level parameters works.

Fix the MSVC version of call_server_func to pop the registers in the
same order they were pushed.

Based on a patch by Mike McCormack.

in an active process, instead of sending a SIGTRAP.

The HDN_ITEMCHANGING notify should have the new data instead of the
old one.  Both HDN_ITEMCHANGING and HDN_ITEMCHANGED now have the text
field if it changed.

Based on some documentation by Rob Shearman.