Cache the enum info so that repeated calls to EnumFontFamiles and such
does not have to repeatedly load the font file.

widl: Remove some confusion in how version numbers are packed into an attribute by defining some macros for this purpose.

Remove unneeded includes.

rpcrt4: Try to free every non-stack pointer in PointerFree now that NdrFree does the sanity checking for us.

rpcrt4: Store allocated memory in a singly-linked list to keep track of what we should and shouldn't free in NdrFree.