Update eslint-plugin-react and fix newly discovered lint errors. #4786
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We had pinned this dependency because it once started causing build failures (#4215) but then by not automatically getting updates, and not merging the new greenkeeper updates (#4221) we didn't see errors that should have been caught by the linter. The old version of the linter didn't catch undefined prop issues completely, which is why this issue wasn't caught by the linter. :sigh:
Talking with @benjiwheeler we decided to unpin it to get new updates, leaning towards possibly breaking the build instead of possibly missing important updates that can catch bugs.
The lint fixes were mostly just missing proptypes, not real bugs. But this includes a small bug where the target pane wouldn't automatically update if changes to the sprite occurred while in fullscreen/player mode (in vm-listener-hoc)
Closes #4221