Add Recently Used section

[jeffpaul]

Is your enhancement related to a problem? Please describe.

Add a new tabbed section called Recently Used that ideally appears as the first tab once someone has previously utilized ISC to add a special character into their post. This section should show the last 80 unique special characters (5 rows of 16 characters in our display) -- unless there's a more ideal/realistic number to limit to here. This may require an upstream PR in https://github.com/Dayjo/react-character-map before being able to update here in the ISC plugin.

Designs

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Describe alternatives you've considered

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