Reconsider and evaluate top-level imports

[DigiDuncan]

Leaving this here so we don't forget it. We need to take a quick lookover on what should be a top-level import, both for clarity, and to possibly reduce build size when arcade is imported.

[pushfoo]

I'm marking the evaluation of top-level imports as 3.0 mandatory since it's a commitment we have to keep to. Build size / packaging should be a separate issue.

[einarf]

I suspect input and media is adding a ~5 second startup time for me on my new laptop. Possibly also text. We have talked about this many times but I'm not sure if there is a clean solution. The rest of the imports I don't think cause any issues.

[cspotcode]

Some python libraries use tricks so that imports load on-demand, completely seamless from the consumer perspective. So if you never access a heavyweight component, it never imports.

[pushfoo]

Possibly also text. We have talked about this many times but I'm not sure if there is a clean solution.

I thought we stopped, but do we still load the Kenny fonts by default?

Some python libraries use tricks so that imports load on-demand, completely seamless from the consumer perspective. So if you never access a heavyweight component, it never imports.

Yep, that's pyglet. They also do some interesting things like having Window change per-platform.