Add a recharge field to features and other applicable elements

[MaximeJosse]

Many abilities in the game can only be cast a certain amount of times until they are recharged. A few examples, not all are SRD compliant but there is no detailed info here :

• bardic-inspiration-1 : Charisma times per long rest
• font-of-inspiration : transforms the long rest in short rest for the bardic inspirations
• wand of magic missiles : 7 charges, 1d6+1 recharge per long rest
• ki : level times per short rest
• Druid Star Map: Guiding bolt : proficiency times per long rest
• Githzerai psionics : Either Shield or Detect through 1 times per long rest

It would be great to have a way to represent the amount of times a feature or one of its element can be used. For example on "ki":

{
    "index": "ki", 
    ...
    "resources": [ {
          "name": "Ki Point",
          "dependency": {
               "name": "ki",
               "url": "...."
          },
           "amount": "${level}",
           "amount": "min(1, ${charisma})",    // Example of a representation of something that could be parsed and evaluated
           "recharge": "short-rest",
           "recharge_amount": "full",
           "action": "various"
     }]
}

Having such a representation would help building automated resource management summaries, with checkboxes or textfield to activate or reduce the available amount of resource of a particular ability.

The current workaround would be to parse the "desc" field and hope we have guessed the right information.