Add automatic read/write items for all pocket items (1-40) (#51)

Decentralizes pocket injection logic from SysBotUI so that other auto-injectors can be passed in (future? like terrain/overworld items).

Adds validation to not modify items if the pocket data doesn't have the expected layout.

Closes #47 by implementing things in a more abstract & extendable way. Thanks @jfmherokiller for the example implementation which served as an inspiration!

NHSE.Injection/SysBot/SwitchButton.cs

@@ -0,0 +1,27 @@
+namespace NHSE.Injection
+{
+    /// <summary>
+    /// Controller Buttons
+    /// </summary>
+    public enum SwitchButton
+    {
+        A,
+        B,
+        X,
+        Y,
+        RSTICK,
+        LSTICK,
+        L,
+        R,
+        ZL,
+        ZR,
+        PLUS,
+        MINUS,
+        DUP,
+        DDOWN,
+        DLEFT,
+        DRIGHT,
+        HOME,
+        CAPTURE,
+    }
+}