This implements setting `ThreadPriorityBoost`, `ProcessPriorityBoost`, `ProcessBasePriority` and getting `ThreadPriorityBoost`, `ProcessPriorityBoost` NT info classes and adds tests where appropriate.
The actual boosting mechanism will be in part 2 to keep the size of this MR manageable.
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https://gitlab.winehq.org/wine/wine/-/merge_requests/7869
Follow-up of !2786, which appears to have been abandoned.
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v19: ws2_32/tests: Add test for AF_UNIX sockets
server: Fix getsockname() and accept() on AF_UNIX sockets.
server: Introduce error when attempting to create a SOCK_DGRAM AF_UNIX socket.
server: Allow for deletion of socket files.
ws2_32: Add support for AF_UNIX sockets.
ws2_32: Add afunix.h header.
https://gitlab.winehq.org/wine/wine/-/merge_requests/7650