Improve HEADER_SendHeaderDispInfoNotify and rename it to
HEADER_PrepareCallbackItems. The new HEADER_FreeCallbackItems frees
the buffers allocated by it. GetItemT and DrawItem calls these
functions.

Mark the callback items in the callbackMask HEADER_ITEM field. The
pszText for callback texts is now NULL what simplifies some
checks. Checks for lpItem->pszText==emptyString are also not needed as
emptyString is not stored in lpItem but used as a parameter to
Str_SetPtr (I haven't noticed it).

Add more tests for daylight-time savings.

Fix base type arm handling on little-endian machines, as the current
code would always pass in the address to the format char of 0x80
instead of the base type format char.

rpcrt4: The NDR memory sizing functions should increment the buffer pointer, so make sure to save it before calling one of these and restore it afterwards.

rpcrt4: Make NdrBaseTypeMemorySize increment the buffer and memory size fields of MIDL_STUB_MESSAGE.

functions and adapt them to be callable without having a correlation
descriptor.