Save plugin preferences with expected static key

[joelamb]

This BREAKING CHANGE fixes issue#238 by correctly using the name property of the plugin class to save preferences.

Updates tests

Why is this a breaking change? Because, any previously saved preferences will no longer work, since the keys they are currently using will not be recognised

[changeset-bot[bot]]

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Latest commit: a11e22e80eb94af693258f406d2bc14f56afd448

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