Not working on FullScreen and Vulkan-BorderlessWindow mode

[zaafar]

Everyone, who is familiar with the overlay technology, knows that Overlay doesn't really work with applications running in FullScreen mode (unless you do some really hacky/brittle stuff e.g. by-passing the OS input system) so that's not really a problem.

However, in this issue, overlay stops working on "Borderless Window" mode as well. This happens only when application, who is being overlayed by the ClickableTransparentOverlay, is using Vulkan APIs.

Acceptance Criteria

• ClickableTransparentOverlay works with Vulkan API in borderless-window mode
• [Optional] ClickableTransparentOverlay works in fullscreen mode as well

Notes

• [Personal preference] Do not hook to the Windows OS input system

Work Around

• Run underlying application in window mode and then use https://github.com/Codeusa/Borderless-Gaming/releases to cover the whole screen.

[zaafar]

Adding WillNotImplement since this is a vulkan API issue.
Vulkan API doesn't really make a real borderless window.