Expose the minimum/maximum size of the root window to project settings

[Jordyfel]

Describe the project you are working on

Not currently, but I was once working on a GUI only project that would appreciate this.

Describe the problem or limitation you are having in your project

Doing get_window().min_size is not that hard, but it's also not the easiest to find for a new user, and the property makes sense for a project setting.

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

The main rationale being that minimum size is a property that is usually set once - needing to change it at runtime is rare.

It is also not that niche - it is useful in GUI heavy projects that support resizing, but making the window too small is undesired (like the project manager), and also in the case of using integer scaling with a stretch mode enabled (see #81176).

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

Trivial

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

Yes...

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

N/A

[Calinou]

Note: I've renamed the proposal to fully encompass the original issue.