🚧Replace all UI controls with IMGUI

[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 #859

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[CalvinWilkinson]

Warning

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

1. Set the maximum size of fonts to be 100. This is technically a breaking behavioral change, but it is anticipated that most people will never render a font with such a large size so the amount of people is expected is to be very small.
2. Removed the AddControl and RemoveControl methods from the IScene interface and SceneBase class.

[CalvinWilkinson]

Important

Added the following https://github.com/KinsonDigital/Velaptor/labels/%E2%9C%A8new%20feature 's

1. Changed the following CornerRadius properties from readonly to readonly init which will allow the use of the with keyboard:
   • TopLeft
   • TopRight
   • BottomRight
   • BottomLeft
2. Integrated a runtime stats window into the core of Velaptor. This window can be shown by using the keyboard key combination Ctrl + Shift + Alt + S.