Added ability to search ticket numbers on a board

A new property was added called `number_searchable` that is the string representation of the ticket number since `Fuse` doesn't seem to search integer columns. The `number_searchable` key is then added to the keys that `Fuse` will search. In order to make searching for ticket numbers be more precise, the `threshold` on the `Fuse` search is modified based on if you are searching for a number or a string.