rpcrt4: For full pointers the state consists of flags, so or new flags into the field instead of assigning.

The return value of all full pointer functions that return an int 
depends on the passed in query type being a flag in the state.

The current wave tests only use a single header for playback.  Tests
have been added to use multiple headers and to reuse them.  This is
how streaming applications and direct sound use the wave api.

This should make it easier to add encryption tests later.

- implemented NtQueryInformationThread's ThreadDescriptorTableEntry
  information class
- used it to implement the kernel32's equivalent (GetThreadSelectorEntry)

- implemented ntdll.NtQueryInformationFile's FilePipeLocalInformation control code 
- reimplemented kernel32.GetNamedPipeInfo on top of it
- enhance current features to make this work both on client and server handles
- now also returning the number of instances

Thanks to Juan Lang for catching this one.

Implement NdrFullPointerFree.