Editing EDF item effects and inventory (section)

====artifact====
An artifact is an item which, when collected, goes into the player's inventory.

 artifact <name>
 {
  amount         <int> // amount gained with one pickup
  maxamount      <int> // max amount that can be carried in inventory
  interhubamount <int> // max amount carryable between levels in different hubs;
                       // -1 if this field should not apply at all
  sortorder      <int> // key used for sorting the player's inventory
  icon           <str> // name of icon graphic for invbar
  usesound       <str> // sound made when item is used
  useeffect      <str> // name of item effect to use for activation
  useaction      <action function> // codepointer and arguments called (e.g. A_GauntletAttack(1))
  
  [+-]undroppable      // if +, cannot be dropped from inventory
  [+-]invbar           // if +, appears in invbar; otherwise, invisible
  [+-]keepdepleted     // if +, will remain in inventory with amount of zero
  [+-]fullamountonly   // if +, cannot pickup unless full amount is needed
  [+-]noshareware      // if +, non-shareware
  
  // artifacttype determines what sort of artifact this is.  
  artifacttype   <str> // "Normal", "Ammo", "Key", "Puzzle", "Power", "Weapon",
                       // or "Quest"
                       
  // The following fields apply only to certain artifact types. They have no
  // effect if specified on other types.
  
  // Ammo
  ammo.backpackamount    <int> // amount of this ammo type given by a Backpack
  ammo.backpackmaxamount <int> // max amount after collecting a Backpack
 
  // Autouse health: this applies only for health-effect artifacts.
  // If enabled, game will automatically trigger when player is about to die,
  // to restore health and keep them alive.
 
  // "none" or "heretic". If "heretic", this is enabled and works like Heretic
  autouse.health.mode     <option>
 
  // Optional restrictions. If omitted, there is no game restriction. Otherwise,
  // it can be a "|"-joined combination of "baby" and "deathmatch". Then the
  // autouse will happen IF ANY of the given conditions are met.
  autouse.health.restrict <flags>
 }