🚧Improve factories

[CalvinWilkinson]

Description:

To allow this pull request to be merged, please make sure that the following items of this pull request are complete.

This pull request closes #791

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[CalvinWilkinson]

Note
Added https://github.com/KinsonDigital/Velaptor/labels/%E2%9C%A8new%20feature 's
Added the following extension methods to the content loaders:

• ILoader<ITexture>.Unload(ITexture?)
• ILoader<IFont>.Unload(IFont?)
• ILoader<ISound>.Unload(ISound?)
• ILoader<IAtlasData>.Unload(IAtlasData?)

[CalvinWilkinson]

*Warning
Introduced the following https://github.com/KinsonDigital/Velaptor/labels/%F0%9F%A7%A8breaking%20changes

1. Removed ContentExtensions.Load(this FontLoader) extension method.
2. Removed the IContentLoader interface.
3. Removed the ContentLoader class.
4. Removed the ContentLoader property from the Window class.
5. Removed the ContentLoader property from the IWindow interface.
6. Removed the ContentLoader property from the IScene interface.
7. Removed the ContentLoader property from the SceneBase class.
8. Removed the CreateContentLoader method from the ContentLoaderFactory static class.
9. Converted the RendererFactory to a static class to follow the same pattern as ContentLoaderFactory
10. Removed the IRendererFactory interface.