Keyboard capture for Windows, too

[bk138]

To intercept hotkeys and the like to go to the remote instead of to the host OS.

https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setwindowshookexw
https://learn.microsoft.com/en-us/windows/win32/winmsg/lowlevelkeyboardproc
https://learn.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-kbdllhookstruct
https://learn.microsoft.com/en-us/windows/win32/inputdev/virtual-key-codes

https://learn.microsoft.com/de-de/windows/win32/api/winuser/nf-winuser-postmessagew
https://devblogs.microsoft.com/oldnewthing/20050530-11/?p=35513
https://devblogs.microsoft.com/oldnewthing/20250319-00/?p=110979

• setup test case
• test translateKeyode - has issues with char vs keydown
• test direct HWND posting - F11 still gets to viewer window somehow, super-left/right still seen by windows host
• test vkToWx - has challenges with shift and control, also when to keydown vs char, but all keys are received, just needs extensive remodeling
• test sendInput - works better than PostMessage w/ Ctrl et al, but Super key gets routed to host Windows, for instance
• check gdk impl - no keyboard grab for win ⛔
• check qt impl - no keyboard grab for win ⛔