This MR improves the handling of numpad keys for drivers using KBDTABLES (only the Wayland driver at this point). It achieves this by: 1. Allowing drivers to send only the scancode in keyboard events, with win32u performing the scan->vkey mapping internally. A nice side effect of this change is that it fixes a few user32 input test TODOs. 2. Enhancing wineserver to read extended KBD vkey attributes and perform numpad key mapping depending on modifier state. 3. Providing default VK_NUMPAD* -> WCHAR mappings in win32u.
-- v3: winewayland.drv: Populate vkey to wchar entry for VK_DECIMAL. server: Send numpad virtual keys if NumLock is active. win32u: Store the full KBD vkey information in kbd_tables_init_vsc2vk. win32u: Allow drivers to send only the scan code for keyboard events.