Add API calls for setting varcs, varbits, etc.

Add API support for arbitrary data storage
Add RememberMyLogin plugin

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

@@ -0,0 +1,44 @@
+package RememberMyLogin
+
+import plugin.Plugin
+import plugin.annotations.PluginMeta
+import plugin.api.API
+import rt4.Component
+import rt4.JagString
+import rt4.Player
+
+@PluginMeta (
+    author = "Ceikry",
+    description = "Stores your last used login for automatic reuse",
+    version = 1.0
+)
+class plugin : Plugin() {
+    var hasRan = false
+    var username = ""
+    var password = ""
+
+    override fun Init() {
+        username = API.GetData("login-user") as? String ?: ""
+        password = API.GetData("login-pass") as? String ?: ""
+    }
+
+    override fun ComponentDraw(componentIndex: Int, component: Component?, screenX: Int, screenY: Int) {
+        if (hasRan || API.IsLoggedIn()) return
+        if (component!!.text == JagString.of("Please Log In")) {
+            API.SetVarcStr(32, username)
+            API.SetVarcStr(33, password)
+            hasRan = true
+        }
+    }
+
+    override fun OnLogin() {
+        username = String(Player.usernameInput.chars)
+        password = String(Player.password.chars)
+        API.StoreData("login-user", username)
+        API.StoreData("login-pass", password)
+    }
+
+    override fun OnLogout() {
+        hasRan = false
+    }
+}