Cleanup following toga.Canvas audit #54
Merged
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Following beeware/toga#2029, some API changes are needed in the usage of Canvas.
This bumps the Toga requirements to the (as yet unreleased) 0.4.0, but relaxes the requirement to only be on toga-core. This allows installation on non-desktop platforms.
Fixes #24.
Fixes #34.
Fixes #57.
PR Checklist: