Add support for multiple Robinhood accounts

[superpowered]

Adds support for multiple Robinhood accounts. (closes #16)

• [ ] Should be able to Enable / Disable Multiple Accounts.
• [ ] Should be able to Add rows of accounts.
• [ ] Should be able to delete rows of accounts. (Excluding the first row)
• [ ] Data should end up stored as an array of objects [{ robinHoodValue: '' }]
• [ ] Data should be sanitized before output
• [ ] Validations should fire on fields if they are blank. (more validations could probably be added here)
• [ ] Should be prompted to set up after toggling Multiple Accounts on or off
• [ ] After Setup of multiple, should be told to remove old single properties
• [ ] After Setup of single, should be told to remove old multiple properties
• [ ] Should only update 4 correct properties on update
• [ ] Should prompt for setup if one or more properties expected is missing
• [ ] Should throw up a warning if a property was found, but could not be updated with the data provided.

Other tidbits:

• Moves urls & interfaces to constants folder
• Removes .vscode/settings.json
• Adds .vscode/settings.json.default so devs can opt in to the projects default settings but still overwrite if needed.
• Adds .vscode/extensions.json recomending eslint as an extension.
• lint:fix command added for quick linting.

[pkmnct]

Just a heads-up, I was thinking about scraping the Robinhood account username and using it as a name on the properties, as a way of allowing multiple accounts to be set up.

[superpowered]

Okay. Definitely will need a bit of cleanup, but should be functional at this point.

[pkmnct]

I'm going to plan to take at look a this over the weekend!

[superpowered]

I'm going to plan to take at look a this over the weekend!

Yeah, hopefully I'll get to look at it some more and clean it up before then. A bit more swamped than usual due to the shorter work week.