[Feature] Different list color based on it's card count

[Rageus]

Is your feature request related to a problem? Please describe.

• We are using trello with an automated workflow.
• For each topic I am working on (while a topic could be a git merge request) the bot of the system will generate some list on my - board. (e.g. a todo list)
• Depending on how many topics I am working on at a time, I might have quite some lists on my board.
• As a consequence I make heavy use of the "list collapsing", "list count" and "list coloring" to reduce the clutter on my board.
• A topic usually goes through multiple iterations and it's lists are only archived once the topic is finished.
• Meaning I often end up with some temporary empty ToDo lists on my board
• One thing I sometimes wish I would have is a way to distinguish empty lists from filled lists at first glance.
• I would like to have a way to color a list only if it contains >0 cards. (or maybe >1 in case there is an info-only card)
• That way I could highlight filled ToDo lists.

Describe the solution you'd like

• Add a column inside the "Global settings/Module settings/Colored lists" next to the "Coloring schemes" Regex column.
• Call the column something like "Required card count"
• Should be of type int with default value zero
• Lets say the value of this is set to 3, then it should only color the list if it's header matches the regex and contains at least 3 cards
• So I could also specify 4 different list colors with 4 times the same regex but with a different card count. (e.g no color for 0, green for >1, yellow for >5, red >15)
• So in case of 10 cards the list should be yellow.