Added support to modify the GLWpfControlSettings within XAML front-end.

[mathew-odwyer]

Description

• Added a Start function overload that does not take any arguments; it relies on the Settings attached property.
  • This required the addition of a new field to check whether the control has been started.
• Modified the example project to showcase both use cases.

Fixes #105

Dependencies

This PR introduces no new dependencies.

Type of change

• New feature (non-breaking change which adds functionality).

How Has This Been Tested?

I tested this locally on my machine and ensured that everything was still functioning as normal within the example project.

Test Configuration:

• Operating System: Windows 10 Home
• Hardware: Intel i7-10710U @ 1.1GHz, 32GB RAM
• Toolchain: VS Community 2022

Proposed Design

<glWpfControl:GLWpfControl
	x:Name="OpenTkControl"
	Render="OpenTkControl_OnRender">
	
        <!-- Add settings object -->
	<glWpfControl:GLWpfControl.Settings>
		<glWpfControl:GLWpfControlSettings MinorVersion="2" MajorVersion="1"/>
	</glWpfControl:GLWpfControl.Settings>
	
</glWpfControl:GLWpfControl>

// Now, we can just call start within the code behind.
this.OpenTKControl.Start();

// Or, provide settings as we did before.
OpenTKControl.Start(new GLWpfControlSettings()
{
	MajorVersion = 2,
	MinorVersion = 1,
	RenderContinuously = false,
});

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[NogginBops]

This looks good to me, is there a reason this is WIP?

[mathew-odwyer]

This looks good to me, is there a reason this is WIP?

I believe there was an issue but I can't remember what it was 😂. I'll be getting to this some time today so hopefully we can get it merged :)

[mathew-odwyer]

Lol, I had major and minor version swapped around; fixed now :)

[mathew-odwyer]

After testing this out once more; everything seems to be working 😊.

If there's anything else I need to do to get this pushed just let me know.

[NogginBops]

This looks great. I'll merge this now and test it out the next time I do some development on GLWpfControl.

Thanks a ton for the PR 🙂 .