Make the DOM renderer the default and move the canvas renderer into an addon #3271
Description
No need to load the code if it's not being used. VS Code has recently transitioned to webgl as the default: microsoft/vscode#106202
Note that I decided we should probably keep the canvas renderer since otherwise Safari/iPad/etc. are stuck with the much slower DOM renderer. The canvas renderer is much better than that and doesn't really need much maintenance at this point.