by passing the correct type format string to ReadConformance.

Add tests for name values, and move tests for different string
encodings to there.

Add some tests for these undocumented functions.

rpcrt4: Add functions for generating and parsing the upper floors in endpoint-mapper towers for different transports.

- Open large popup menus on the other side only if there's enough space
- Open popup menus such that the y position of the first item in the
  popup menu is the same as the y position of the focused menu item.

Replace all 'while (PeekMessage()) DispatchMessage();' loops in the
PeekMessage test by explicit calls to PeekMessage(), check queue
status and processed messages after each call to see what is going on
behind the scene.

Use a unique port name for the message port to the message thread.
Port names are system-global, so using a non-unique constant name
prevents the CoreAudio driver from being used in multiple processes
simultaneously.