feat: add initial People Playground mod development kit

extracted_wiki_content/internalReference/inputsystem.txt

@@ -0,0 +1,52 @@
+URL: https://wiki.studiominus.nl/internalReference/InputSystem.html
+Title: People Playground Modding - InputSystem
+==================================================
+
+public static class InputSystem
+[Serializable]
+No description provided
+Fields
+public static Dictionary<string, InputAction> Actions
+No description provided
+
+public const string FilePath
+No description provided
+Constant value: "ControlScheme.json"
+
+public static ActionUniverse CurrentUniverse
+No description provided
+
+Methods
+public static bool IsInUniverse(ActionUniverse other)
+No description provided
+
+public static void Initialise()
+No description provided
+
+public static void Save()
+No description provided
+
+public static void ResetToDefaults()
+No description provided
+
+public static void Load()
+No description provided
+
+public static void SimulatePress(string identifier)
+[System.Obsolete]
+No description provided
+
+public static string GetDisplayText(string name)
+No description provided
+
+public static bool Has(string name)
+No description provided
+
+public static bool Held(string name)
+No description provided
+
+public static bool Down(string name)
+No description provided
+
+public static bool Up(string name)
+No description provided