This update to the Visual Profiler aims to:

• Introduce new statistics that are now possible to track in Unity 2020.x+ (such as draw call and vertex counts)
• Improve performance by eliminating all managed per frame allocations, emits only 1 draw call for the entire UI, and doesn't create any game objects
• Custom (simple) text renderer for improved performance
• Updated docs to reflect package workflow

Address #10 to an extent.

Tested in editor, standalone, HoloLens 2, Quest 2, and WebGL.