Initial implementation for registry application hives, this is a step forward to get Visual Studio to run. :-)
-- v5: server: save app hive into it's file when closing handle. server/registry: pass file name instead of file handle to server. kernelbase: Implement RegLoadAppKey. ntdll: Initial implementation for application hives. ntdll: Move NtLoadKey implementation to NtLoadKeyEx. ntdll/test: Test for application hives. ntdll: Create NtLoadKeyEx syscall stub. advapi32/test: Create tests for RegLoadAppKey.