Begin work on outlining dynamic side

PkmnLib.Dynamic/ScriptHandling/ScriptSource.cs

@@ -0,0 +1,52 @@
+namespace PkmnLib.Dynamic.ScriptHandling;
+
+public interface IScriptSource
+{
+    ScriptIterator GetScripts();
+    
+    /// <summary>
+    /// The number of scripts that are expected to be relevant for this source. This generally is
+    /// The number of its own scripts + the number of scripts for any parents.
+    /// </summary>
+    int ScriptCount { get; }
+
+    /// <summary>
+    /// This should add all scripts belonging to this source to the scripts Vec, disregarding its
+    /// potential parents.
+    /// </summary>
+    /// <param name="scripts"></param>
+    void GetOwnScripts(List<IEnumerable<ScriptContainer>> scripts);
+
+    /// <summary>
+    /// This should add all scripts that are relevant to the source the the scripts Vec, including
+    /// everything that belongs to its parents.
+    /// </summary>
+    /// <param name="scripts"></param>
+    void CollectScripts(List<IEnumerable<ScriptContainer>> scripts);
+}
+
+public abstract class ScriptSource : IScriptSource
+{
+    /// <inheritdoc />
+    public ScriptIterator GetScripts()
+    {
+        if (_scripts == null)
+        {
+            _scripts = new List<IEnumerable<ScriptContainer>>(ScriptCount);
+            CollectScripts(_scripts);
+        }
+        return new ScriptIterator(_scripts);
+    }
+
+    /// <inheritdoc />
+    public abstract int ScriptCount { get; }
+
+    /// <inheritdoc />
+    public abstract void GetOwnScripts(List<IEnumerable<ScriptContainer>> scripts);
+
+    /// <inheritdoc />
+    public abstract void CollectScripts(List<IEnumerable<ScriptContainer>> scripts);
+
+    /// <inheritdoc />
+    private List<IEnumerable<ScriptContainer>>? _scripts;
+}