missing WaitForInputIdle and GetWindowModuleFileName

[StephanVerbeeck]

Could you merge these functions?

var (
	moduser32                  = syscall.NewLazyDLL("user32.dll")
	procWaitForInputIdle       = moduser32.NewProc("WaitForInputIdle")
	proGetWindowModuleFileName = moduser32.NewProc("GetWindowModuleFileNameW")
)

// WaitForInputIdle waits until the specified process has finished processing its initial input and is waiting for user input with no input pending, or until the time-out interval has elapsed.
func WaitForInputIdle(hwnd win.HWND, timeoutMsec int) {
	_, _, _ = procWaitForInputIdle.Call(
		uintptr(hwnd),
		uintptr(timeoutMsec))
}

// GetWindowModuleFileName retrieves the full path and file name of the module associated with the specified window handle.
func GetWindowModuleFileName(hwnd win.HWND) (moduleFileName string) {
	bufLen := 1000
	buf := make([]uint16, bufLen+1)
	textLen, _, _ := proGetWindowModuleFileName.Call(
		uintptr(hwnd),
		uintptr(unsafe.Pointer(&buf[0])),
		uintptr(bufLen))

	if textLen > 0 { // processes of other owner do not reveal their info (unless we have elevated privilege)
		moduleFileName = syscall.UTF16ToString(buf)
	}
	return
}