Add a Window property to hide the close button

[DragonMaster14545]

Describe the project you are working on

Im currently changing a lot of my menus to use windows, because that just feels better imo

Describe the problem or limitation you are having in your project

There is no way to hide the close button on built in windows

Describe the feature / enhancement and how it helps to overcome the problem or limitation

Add a flag that just hides the button

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

When the flag is true, set the close button to visible false

If this enhancement will not be used often, can it be worked around with a few lines of script?

I unfortunately found no way to get the instance of the close button

Is there a reason why this should be core and not an add-on in the asset library?

This is a qol feature for built in windows that should not require an extra addon from the asset library