This patch implements core pointer input APIs required by modern applications with touchscreen support, particularly Chromium and Qt-based applications. Implemented APIs: - GetPointerType: Query pointer input type (touch, pen, mouse) - GetPointerTouchInfo: Retrieve detailed touch pointer information - GetPointerFrameTouchInfo: Get all active touch pointers in current frame Added stubs: - SkipPointerFrameMessages: Used by applications to skip pointer frame processing like Qt - GetPointerFrameTouchInfoHistory: Historical touch frame data (not yet implemented) - GetPointerPenInfoHistory: Historical pen data (not yet implemented) System metrics changes: - SM_DIGITIZER: Reports touch capabilities (NID_INTEGRATED_TOUCH | NID_MULTI_INPUT | NID_READY) - SM_MAXIMUMTOUCHES: Returns maximum simultaneous touch points (10) Limitations: - We explictly set pointer type to PT_TOUCH when storing pointer info to queue, so GetPointerType will always return PT_TOUCH - GetPointerFrameTouchInfo returns 0 pointers after finger lift, while Windows returns 1 pointer with UP flags. And SkipPointerFrameMessages is currently a stub returning TRUE. Qt's pointer message processing uses both of them, but it's just working well Application requirements: - Chromium: Requires GetPointerType and GetPointerTouchInfo for touch input - Qt applications: Need GetPointerFrameTouchInfo and proper system metrics for multi-touch support - Qt5: Additionally checks for presence of all pointer APIs at runtime, requiring stubs to enable pointer messages processing -- v8: user32: Implement GetPointerFrameTouchInfo win32u: Implement NtUserGetPointerFrameTouchInfo user32: Implement GetPointerTouchInfo win32u: Implement NtUserGetPointerTouchInfo user32: Implement GetPointerType win32u: Implement NtUserGetPointerType win32u: Add pointer information cache and storage user32: Stub GetPointerPenInfoHistory user32: Stub GetPointerFrameTouchInfoHistory user32: Stub SkipPointerFrameMessages win32u: Add SM_DIGITIZER and SM_MAXIMUMTOUCHES system metrics https://gitlab.winehq.org/wine/wine/-/merge_requests/9628