This commit makes `CDebug` use Unicode internally instead of whatever
random code page is in use. It also gets rid of the horrible character
counting and replaces that with `vasprintf` and `vaswprintf` helpers
(partially inspired by Linux) which allocates a buffer.
For HRESULT logging, the error code in both hex and decimal are included.
The output is now guaranteed to be UTF-8.
As the IDD itself runs in a WUMDF sandbox, it doesn't have enough
access to perform interactive operations such as moving the cursor.
This helper service communicates with the IDD over a named pipe,
so that we can perform these things, as well as in the future provide
a configuration GUI.
