Add in edibility to editor.html for text box

[tomkennedy22]

This PR adds in 2 buttons to editor.html, which gives the following functionality:

Draw JSON:

• Draws the JSON provided in the text box
• This allows users to manually change the text in the box & render
• This will be easier for copying player face JSON from apps like BBGM and fine-tuning their looks
• If the user inputs invalid JSON, we'll throw an alert saying "Invalid JSON submitted"
• It uses the override function, so if the user omits a feature (eye, ear, etc), we'll use whatever feature is currently on screen
• Calls updateDisplay like elsewhere within editor.html

Reset from drawing:

• If the user makes changes in the text box but realize they don't like what they changed and want the original back, they just press this button
• Just stringify current version of face

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Tests ran:

1. Input invalid JSON - it throws Alert & resets
2. Input valid JSON, but invalid value - "Hello" in ear size. It throws an alert
3. Input valid JSON, but a feature ID that does not exist. It throws an alert and has empty feature
4. Remove feature - it uses existing face feature

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Request for input:

• If the user inputs JSON text for a feature id that doesn't exist... like some hair you don't have - do we throw alert?Just let it be empty?
• Different button names?
• Should we disable the "reset" button if no changes made?

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What the buttons look like:

[tomkennedy22]

Closing this, as it is mostly included in #35