[Feature Request] Support dynamically created Counters

[CrowbarToolsRobot]

ebiggz via Discord:

Add support for dynamically created Counters.

Use cases:

• per game death counters (counter automatically creates for a game if it doesnt exist yet
• per user counters for various things

Could be as simple as updating the $counter variable with an optional boolean to automatically create counter if it doesn't exist.

However, there may be an expectation that we "copy" an existing counter and retain things such as effect setups. Such behavior is technically possible, but might start to get hairy. Implications will have to be thought through.