chore: Remove deprecated drawing API surface

[eonarheim]

===:clipboard: PR Checklist :clipboard:===

• 📌 issue exists in github for these changes
• 🔬 existing tests still pass
• 🙈 code conforms to the style guide
• 📐 new tests written and passing / old tests updated with new scenario(s)
• 📄 changelog entry added (or not needed)

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This is related to the v0.26.0 roadmap #1161

The old drawing API had been removed from excalibur, this should not affect you unless you were using the ex.Flags.useLegacyDrawing() or ex.Flags.useCanvasGraphicsContext().

• Notably all implementations of Drawable are removed, use the new Graphics API
• Methods on actor ex.Actor.setDrawing(...), ex.Actor.addDrawing(...) are removed, use the ex.Actor.graphics.add(...), ex.Actor.graphics.show(...) and ex.Actor.graphics.use(...)
• The ex.Actor.onPreDraw(...) and ex.Actor.onPostDraw(...) are removed, use ex.Actor.graphics.onPreDraw(...) and ex.Actor.graphics.onPostDraw(...)
• The events predraw and postdraw are removed
• ex.Scene.onPreDraw() and ex.Scene.onPostDraw() are now called with the ExcaliburGraphicsContext instead of an CanvasRenderingContext2D

There were 2 things added during in this process

1. Bugfix, zero dimension bounding boxes were considered offscreen even when they were positioned on screen
2. Scene clearing was implemented which was needed for some testing methods