Print format for failed SetFormat calls.

unicode counterparts.

- Make sure to release the dplayx semaphore in for error cases as well.
- Prevent race condition between creation of the semaphore and
  grabbing of the lock by creating the semaphore in the locked state
  instead of unlocked.

Using alpha bits > 8 makes this function fail, while it should not.

buffer in the convert_888_to_0888_* functions.

to NULL when net_loc isn't present in the input URL.

thread creation function to the NTDLL one.

Ues pipe sync code from OSS/ALSA rather than windows events.

- create a base cert context, and make functions unaware whether
  they're dealing with the base or derived type
- simplify stores as a result