Added readonly WindowID and GLContextID variables to Window

[TheRealNOIG]

Changed permission level on window ID and glContext ID to allow other classes to retrieve this information.

[giawa]

What use case did you have where you need these public? Since these are set by the Window (and should never be modified) I think it would make more sense to add a read-only property. Would that work for you?

[TheRealNOIG]

That would work without issue. My use case is checking if the SDL window has been initiated yet.

[TheRealNOIG]

I now see the Open boolean in the Window class. But there is still times you would need access to the windowID and the original glContext. One example would be using a single context for multiple windows.

[giawa]

Okay, do you mind updating this PR with read-only properties instead of marking the field as public? Then I can merge the PR. Thanks!

[TheRealNOIG]

Code updated