Allow cells to be formatted as numbers

[duckbrain]

Allows cells to be number formatted by prefixing the value with a # followed by a valid numeric string. In the template, the number formatting can be applied to an individual cell to have the looped rows each have that formatting when formatted as a number.

This allows users viewing the Excel file to select ranges to see a sum, create formulas that do arithmetic on cells, and much more.

Example

Template

Name	Pay
{{range users}}
{{name }}	#{{pay}}
{{end}}

Data

[
  {
    "name": "Alice",
    "pay": 27
  },
  {
    "name": "Bob",
    "pay": 31.5
  }
]

Reults

Name	Pay
Alice	$27.00
Bob	$31.50

It's untested if this works with timestamps, but if not. I'd submit @ as a prefix to signify it.