additional Unicode win api calls, +SwapBuffers, +ChoosePixelFormat, Pixel format descriptor enum
added missing PFD_ flags, enum type to int
core.sys.windows.windows: Add file locking APIs
core.stdc.stdio: Add MSVCRT functions to convert between fds and HANDLEs
Merge pull request #700 from CyberShadow/windows-locks

core.sys.windows.windows: Add file locking APIs
Merge pull request #701 from CyberShadow/osfhandle

core.stdc.stdio: Add MSVCRT functions to convert between fds and HANDLEs
core.sys.windows.windows: Add ERROR_ALREADY_EXISTS
Merge pull request #702 from CyberShadow/error_already_exists

core.sys.windows.windows: Add ERROR_ALREADY_EXISTS
rt.dmain2: Fix Issue 11865 - Unhandled exception does not show crash dialog

If a console window is not present, display uncaught exceptions
in a standard Windows message box.
rt.dmain2: Use core.sys.windows.windows
Merge pull request #703 from CyberShadow/windows-crash-dialog

Fix Issue 11865 - Unhandled exception does not show crash dialog
Add W functions
Merge pull request #704 from 9rnsr/fix_windows

Add W functions
Merge pull request #695 from foobit/master

additional Unicode win api, +SwapBuffers, +ChoosePixelFormat
MSG in DispatchMessage is a const input parameter
Merge pull request #705 from MartinNowak/constDispatchMsg

MSG in DispatchMessage is a const input parameter