Returns a bitmask of the combined window flags that can be used in OpenWindow() to set the mode for the window.
Each flag is a boolean that determines whether or not to set that flag in the mask.
Note: For most use cases, one of the following will work
Window
mode = WindowMode(1, 0, 0, 0, 0)
Fullscreen
mode = WindowMode(1, 1, 0, 0, 0)
Related: OpenWindow GetWindowMode