Added toggle resizeable SD plugin

This also fixes two CMEs, very cool.

plugin-playground/src/main/kotlin/ToggleResizableSD/plugin.kt

@@ -0,0 +1,53 @@
+package ToggleResizableSD
+
+import plugin.Plugin
+import plugin.annotations.PluginMeta
+import plugin.api.API
+import rt4.DisplayMode
+import rt4.GameShell
+import java.awt.event.KeyAdapter
+import java.awt.event.KeyEvent
+
+@PluginMeta (
+    author = "ipkpjersi",
+    description = "Allows you to use F12 to toggle resizable SD.",
+    version = 1.0
+)
+class plugin : Plugin() {
+    var toggleResize = false
+    override fun Init() {
+        API.AddKeyboardListener(object : KeyAdapter() {
+            override fun keyPressed(e: KeyEvent) {
+                if (e.keyCode == KeyEvent.VK_F12) {
+                    toggleResize = true
+                }
+            }
+        })
+    }
+    
+    override fun ProcessCommand(commandStr: String, args: Array<out String>?) {
+        when(commandStr.toLowerCase()) {
+            "::resizablesd" -> {
+                toggleResize = true //We could call toggleResizableSd() directly here, but it's not necessary.
+            }
+        }
+    }
+    
+    fun toggleResizableSd() {
+        DisplayMode.resizableSD = !DisplayMode.resizableSD;
+        if(!DisplayMode.resizableSD){
+            //Revert to fixed
+            DisplayMode.setWindowMode(true, 0, -1, -1)
+        } else {
+            //Use resizable
+            DisplayMode.setWindowMode(true, 0, GameShell.frameWidth, GameShell.frameHeight)
+        }
+    }
+    
+    override fun Draw(timeDelta: Long) {
+        if (toggleResize) {
+            toggleResizableSd()
+            toggleResize = false
+        }
+    }
+}