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.
-- v3: kernel32/tests: Add tests for GetProcessPriorityBoost/SetProcessPriorityBoost. kernelbase: Implement SetProcessPriorityBoost. kernelbase: Implement GetProcessPriorityBoost. ntdll: Implement ProcessPriorityBoost class in NtSetInformationProcess. ntdll: Implement ProcessPriorityBoost class in NtQueryInformationProcess. ntdll: Implement ThreadPriorityBoost class in NtSetInformationThread. ntdll: Properly implement ThreadPriorityBoost class in NtQueryInformationThread. ntdll/tests: Add tests for setting process base priority. ntdll: Implement ProcessBasePriority class in NtSetInformationProcess.