Destroy unused handles on WM_DISPLAYCHANGE

[fedejeanne]

Issue

Currently, the OS handles for resources in an unnecessary zoom level are being removed when the OS-event WM_DPICHANGED is triggered (see eclipse-platform/eclipse.platform.swt#1477). This poses a problem because this event is only triggered in 2 situations:

1. The window is dragged to a monitor with different scaling
2. The monitor where the window is located changes its scaling

But there is one scenario when this event is not triggered, that is:
3. A monitor that does not contain the window changes its scaling.

Goal

Do a PoC and see if it's possible to react to another event and trigger the cleanup: WM_DISPLAYCHANGE

[fedejeanne]

@amartya4256 fyi