Add Initial Support for a Stock Ticker

[mggates39]

Description

This begins to addresses Issue 341

• Uses the FinHub API https://finnhub.io/docs/api/introduction.
• Needs a free API Key stored in your secrets.h file. It can be an empty string.
• Accepts a comma separated list of stock symbols, any exchange.
• Shows the data for each stock one at a time for 30 seconds.
• Shows Current Price color coded for direction of change Red, Green, White.
• Alternates the daily high and low prices and the opening and closing prices.

Additional Work Pending

• Scrolling of more than one symbol. Now it just switches between symbols every 30 seconds.
• Add additional data: the amount and percentage of change, Market Cap, and number of outstanding shares.
• Any other suggested features

Contributing requirements

• [x] I read the contribution guidelines in CONTRIBUTING.md.
• [x] I understand the BlinkenPerBit metric, and maximized it in this PR.
• [x] I selected main as the target branch.
• [x] All code herein is subjected to the license terms in COPYING.txt.