Add Android project settings for gesture support

- Include project setting to enable long press for Android devices
- Include project setting to enable pan and scale gestures on Android devices

doc/classes/InputEventMagnifyGesture.xml

@@ -3,6 +3,7 @@
 	<brief_description>
 	</brief_description>
 	<description>
+		[b]Note:[/b] On Android, this requires the [member ProjectSettings.input_devices/pointing/android/enable_pan_and_scale_gestures] project setting to be enabled.
 	</description>
 	<tutorials>
 	</tutorials>

doc/classes/InputEventPanGesture.xml

@@ -3,6 +3,7 @@
 	<brief_description>
 	</brief_description>
 	<description>
+		[b]Note:[/b] On Android, this requires the [member ProjectSettings.input_devices/pointing/android/enable_pan_and_scale_gestures] project setting to be enabled.
 	</description>
 	<tutorials>
 	</tutorials>

doc/classes/ProjectSettings.xml

@@ -808,6 +808,12 @@
 			If [code]false[/code], no input will be lost.
 			[b]Note:[/b] You should in nearly all cases prefer the [code]false[/code] setting. The legacy behavior is to enable supporting old projects that rely on the old logic, without changes to script.
 		</member>
+		<member name="input_devices/pointing/android/enable_long_press_as_right_click" type="bool" setter="" getter="" default="false">
+			If [code]true[/code], long press events on an Android touchscreen are transformed into right click events.
+		</member>
+		<member name="input_devices/pointing/android/enable_pan_and_scale_gestures" type="bool" setter="" getter="" default="false">
+			If [code]true[/code], multi-touch pan and scale gestures are enabled on Android devices.
+		</member>
 		<member name="input_devices/pointing/emulate_mouse_from_touch" type="bool" setter="" getter="" default="true">
 			If [code]true[/code], sends mouse input events when tapping or swiping on the touchscreen.
 		</member>

main/main.cpp

@@ -1619,6 +1619,9 @@ Error Main::setup2(Thread::ID p_main_tid_override) {
 		id->set_emulate_mouse_from_touch(bool(GLOBAL_DEF("input_devices/pointing/emulate_mouse_from_touch", true)));
 	}
 
+	GLOBAL_DEF("input_devices/pointing/android/enable_long_press_as_right_click", false);
+	GLOBAL_DEF("input_devices/pointing/android/enable_pan_and_scale_gestures", false);
+
 	MAIN_PRINT("Main: Load Translations and Remaps");
 
 	translation_server->setup(); //register translations, load them, etc.

platform/android/java/lib/src/org/pandemoniumengine/pandemonium/Pandemonium.java

@@ -120,6 +120,7 @@ import org.pandemoniumengine.pandemonium.plugin.PandemoniumPluginRegistry;
 import org.pandemoniumengine.pandemonium.utils.BenchmarkUtils;
 import org.pandemoniumengine.pandemonium.utils.PandemoniumNetUtils;
 import org.pandemoniumengine.pandemonium.utils.PermissionsUtil;
+import org.pandemoniumengine.pandemonium.input.PandemoniumInputHandler;
 
 public class Pandemonium extends Fragment implements SensorEventListener, IDownloaderClient {
 	private static final String TAG = Pandemonium.class.getSimpleName();
@@ -331,6 +332,21 @@ public class Pandemonium extends Fragment implements SensorEventListener, IDownl
 	 */
 	@CallSuper
 	protected void onPandemoniumSetupCompleted() {
+		Log.d(TAG, "onPandemoniumSetupCompleted");
+
+		// These properties are defined after Godot setup completion, so we retrieve them here.
+		boolean longPressEnabled = Boolean.parseBoolean(PandemoniumLib.getGlobal("input_devices/pointing/android/enable_long_press_as_right_click"));
+		boolean panScaleEnabled = Boolean.parseBoolean(PandemoniumLib.getGlobal("input_devices/pointing/android/enable_pan_and_scale_gestures"));
+
+		runOnUiThread(() -> {
+			PandemoniumView renderView = getRenderView();
+			PandemoniumInputHandler inputHandler = renderView != null ? renderView.getInputHandler() : null;
+			if (inputHandler != null) {
+				inputHandler.enableLongPress(longPressEnabled);
+				inputHandler.enablePanningAndScalingGestures(panScaleEnabled);
+			}
+		});
+
 		for (PandemoniumPlugin plugin : pluginRegistry.getAllPlugins()) {
 			plugin.onPandemoniumSetupCompleted();
 		}
@@ -345,6 +361,8 @@ public class Pandemonium extends Fragment implements SensorEventListener, IDownl
 	 */
 	@CallSuper
 	protected void onPandemoniumMainLoopStarted() {
+		Log.d(TAG, "onPandemoniumMainLoopStarted");
+
 		for (PandemoniumPlugin plugin : pluginRegistry.getAllPlugins()) {
 			plugin.onPandemoniumMainLoopStarted();
 		}