Split stdlib into Python 2 and 3 versions (#5442)

All new files in stdlib/@python2 are straight copies of the
corresponding files in stdlib.

stdlib/@python2/winreg.pyi

@@ -0,0 +1,98 @@
+from types import TracebackType
+from typing import Any, Optional, Tuple, Type, Union
+
+_KeyType = Union[HKEYType, int]
+
+def CloseKey(__hkey: _KeyType) -> None: ...
+def ConnectRegistry(__computer_name: Optional[str], __key: _KeyType) -> HKEYType: ...
+def CreateKey(__key: _KeyType, __sub_key: Optional[str]) -> HKEYType: ...
+def CreateKeyEx(key: _KeyType, sub_key: Optional[str], reserved: int = ..., access: int = ...) -> HKEYType: ...
+def DeleteKey(__key: _KeyType, __sub_key: str) -> None: ...
+def DeleteKeyEx(key: _KeyType, sub_key: str, access: int = ..., reserved: int = ...) -> None: ...
+def DeleteValue(__key: _KeyType, __value: str) -> None: ...
+def EnumKey(__key: _KeyType, __index: int) -> str: ...
+def EnumValue(__key: _KeyType, __index: int) -> Tuple[str, Any, int]: ...
+def ExpandEnvironmentStrings(__str: str) -> str: ...
+def FlushKey(__key: _KeyType) -> None: ...
+def LoadKey(__key: _KeyType, __sub_key: str, __file_name: str) -> None: ...
+def OpenKey(key: _KeyType, sub_key: str, reserved: int = ..., access: int = ...) -> HKEYType: ...
+def OpenKeyEx(key: _KeyType, sub_key: str, reserved: int = ..., access: int = ...) -> HKEYType: ...
+def QueryInfoKey(__key: _KeyType) -> Tuple[int, int, int]: ...
+def QueryValue(__key: _KeyType, __sub_key: Optional[str]) -> str: ...
+def QueryValueEx(__key: _KeyType, __name: str) -> Tuple[Any, int]: ...
+def SaveKey(__key: _KeyType, __file_name: str) -> None: ...
+def SetValue(__key: _KeyType, __sub_key: str, __type: int, __value: str) -> None: ...
+def SetValueEx(
+    __key: _KeyType, __value_name: Optional[str], __reserved: Any, __type: int, __value: Union[str, int]
+) -> None: ...  # reserved is ignored
+def DisableReflectionKey(__key: _KeyType) -> None: ...
+def EnableReflectionKey(__key: _KeyType) -> None: ...
+def QueryReflectionKey(__key: _KeyType) -> bool: ...
+
+HKEY_CLASSES_ROOT: int
+HKEY_CURRENT_USER: int
+HKEY_LOCAL_MACHINE: int
+HKEY_USERS: int
+HKEY_PERFORMANCE_DATA: int
+HKEY_CURRENT_CONFIG: int
+HKEY_DYN_DATA: int
+
+KEY_ALL_ACCESS: int
+KEY_WRITE: int
+KEY_READ: int
+KEY_EXECUTE: int
+KEY_QUERY_VALUE: int
+KEY_SET_VALUE: int
+KEY_CREATE_SUB_KEY: int
+KEY_ENUMERATE_SUB_KEYS: int
+KEY_NOTIFY: int
+KEY_CREATE_LINK: int
+
+KEY_WOW64_64KEY: int
+KEY_WOW64_32KEY: int
+
+REG_BINARY: int
+REG_DWORD: int
+REG_DWORD_LITTLE_ENDIAN: int
+REG_DWORD_BIG_ENDIAN: int
+REG_EXPAND_SZ: int
+REG_LINK: int
+REG_MULTI_SZ: int
+REG_NONE: int
+REG_QWORD: int
+REG_QWORD_LITTLE_ENDIAN: int
+REG_RESOURCE_LIST: int
+REG_FULL_RESOURCE_DESCRIPTOR: int
+REG_RESOURCE_REQUIREMENTS_LIST: int
+REG_SZ: int
+
+REG_CREATED_NEW_KEY: int  # undocumented
+REG_LEGAL_CHANGE_FILTER: int  # undocumented
+REG_LEGAL_OPTION: int  # undocumented
+REG_NOTIFY_CHANGE_ATTRIBUTES: int  # undocumented
+REG_NOTIFY_CHANGE_LAST_SET: int  # undocumented
+REG_NOTIFY_CHANGE_NAME: int  # undocumented
+REG_NOTIFY_CHANGE_SECURITY: int  # undocumented
+REG_NO_LAZY_FLUSH: int  # undocumented
+REG_OPENED_EXISTING_KEY: int  # undocumented
+REG_OPTION_BACKUP_RESTORE: int  # undocumented
+REG_OPTION_CREATE_LINK: int  # undocumented
+REG_OPTION_NON_VOLATILE: int  # undocumented
+REG_OPTION_OPEN_LINK: int  # undocumented
+REG_OPTION_RESERVED: int  # undocumented
+REG_OPTION_VOLATILE: int  # undocumented
+REG_REFRESH_HIVE: int  # undocumented
+REG_WHOLE_HIVE_VOLATILE: int  # undocumented
+
+error = OSError
+
+# Though this class has a __name__ of PyHKEY, it's exposed as HKEYType for some reason
+class HKEYType:
+    def __bool__(self) -> bool: ...
+    def __int__(self) -> int: ...
+    def __enter__(self) -> HKEYType: ...
+    def __exit__(
+        self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType]
+    ) -> Optional[bool]: ...
+    def Close(self) -> None: ...
+    def Detach(self) -> int: ...