Request: Configurable Hit-a-Hint character list

[mtalexan]

The Hit-a-Hint character list used to determine/assign the labels is a hardcoded list in the code. Most other Hit-a-Hint mechanisms allow the user to set this list for themselves in the extension/add-on configuration.

For example, I personally dislike the semi-colon character since I find it hard to see when it's the second character in a 2-character hint. Having a configuration box in the extension/add-on settings for a sequence of characters that has a minimum required length and restrictions on what characters are allowed to be included would allow users to specify both their preferential order for the characters in the hinting, and add or limit what characters are used.