Add ImPlatformIO, ImGuiViewport

imgui-binding/src/main/java/imgui/callback/ImPlatformFuncViewportSuppBoolean.java

@@ -0,0 +1,10 @@
+package imgui.callback;
+
+import imgui.ImGuiViewport;
+
+/**
+ * Callback to represent ImGuiPlatformIO function with args: (ImGuiViewport*) -> Boolean
+ */
+public abstract class ImPlatformFuncViewportSuppBoolean {
+    public abstract boolean get(ImGuiViewport vp);
+}