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.

[pkmnct]

Rather than having the user manually enter their account names, we can just scrape the account name every time we sync Robinhood. If the multiple account setting is not enabled, the value is ignored.

If it is enabled, we do a setup check (similar to the initial setup), where we check if this device has synced with the Robinhood account logged in. (These could be stored in an array in chrome.storage.sync). If the current device has not set up that account before, we can then trigger the property setup/check.

This would give users a more seamless experience, and reduce logic on the settings page since it would just be a checkbox.

[superpowered]

Alright, latest push should accomplish this...
Need to probably test some of the flows and make sure the notifications seem correct in each one.

... Probably also need to add a delete script under the debug at some point, more just for convienence, since adding and deleting all these accounts is crazy tedious.

Changing the returnValue.accountName = accountNameElement.innerText; to a static value works well enough for testing to add new accounts.