Add support for Token Initiative variant

[asacolips]

Changes

• Added new 'Token Actions' setting to enable the token initiative variant rule. If this setting is enabled, the action counter in the combat sidebar will instead represent the two actions each character has each round. Resetting the actor's action count or advancing to the next round will reset this back up to 2.
• Added tokenActions field to actors that can be used to track remaining actions each round. This can be added as a resource to the actor's token, displaying it as a progress bar on the actor.
• Updated combat tracker to work with the harm pools house rule.

Screenshots