Verify all the functionality on the Number Lock layer

[StevenTammen]

A basic list of special functionality to verify:

• Automatically adding thousands separators in the correct positions
  • Standalone key
  • When formatting as dollars
• Adding dollar sign
  • When formatting as dollars
• Hundreds, thousands, millions, billions, trillions behave as expected
  • Hundreds and thousands add two and three zeroes, respectively. The other three add the word "million", "billion", and "trillion", respectively. Then if followed by dollar formatting, the dollar sign still gets properly added at the front. Eventually, when in number entry mode, the default behavior will be to make million, billion, and trillion enter 6/9/12 zeroes, respectively. It's just that in normal prose, we typically write out the words, rather than entering that many zeroes.

All of these keys do not have any special functionality:

• 0-9 (number keys themselves)
• Decimal point, percentage sign, colon, hyphen, and backslash

All of these things behave exactly like they do on the Base Lock layer:

• ()., {Enter} {Backspace}
• Layer leader keys

Leave these things as TODOs for now:

• Write out
• Other currency