feat: only allow specific selectable values for the cooldown duration of spells

World data (including compendium packs) is migrated automatically. In order to also migrate packs
provided by modules, you can use the following macro:
```js
const pack = game.packs.get("<name-of-the-module>.<name-of-the-pack>");
game.ds4.migration.migrateCompendiumFromTo(pack, 4, 5);
```

src/config.ts

@@ -106,6 +106,17 @@ const i18nKeys = {
         unset: "DS4.SpellCategoryUnset",
     },
 
+    cooldownDurations: {
+        "0r": "DS4.CooldownDuration0R",
+        "1r": "DS4.CooldownDuration1R",
+        "2r": "DS4.CooldownDuration2R",
+        "5r": "DS4.CooldownDuration5R",
+        "10r": "DS4.CooldownDuration10R",
+        "100r": "DS4.CooldownDuration100R",
+        "1d": "DS4.CooldownDuration1D",
+        d20d: "DS4.CooldownDurationD20D",
+    },
+
     /**
      * Define the set of actor types
      */
@@ -276,16 +287,6 @@ const i18nKeys = {
         minutes: "DS4.UnitMinutes",
         hours: "DS4.UnitHours",
         days: "DS4.UnitDays",
-    },
-
-    /**
-     * Define translations for available duration units including "custom"
-     */
-    customTemporalUnits: {
-        rounds: "DS4.UnitRounds",
-        minutes: "DS4.UnitMinutes",
-        hours: "DS4.UnitHours",
-        days: "DS4.UnitDays",
         custom: "DS4.UnitCustom",
     },
 
@@ -297,16 +298,6 @@ const i18nKeys = {
         minutes: "DS4.UnitMinutesAbbr",
         hours: "DS4.UnitHoursAbbr",
         days: "DS4.UnitDaysAbbr",
-    },
-
-    /**
-     * Define abbreviations for available duration units including "custom"
-     */
-    customTemporalUnitsAbbr: {
-        rounds: "DS4.UnitRoundsAbbr",
-        minutes: "DS4.UnitMinutesAbbr",
-        hours: "DS4.UnitHoursAbbr",
-        days: "DS4.UnitDaysAbbr",
         custom: "DS4.UnitCustomAbbr",
     },