add newline feature to the text node, add about window with credits, add about menu with submenus

android/CMakeLists.txt

@@ -56,6 +56,7 @@ add_library(
 	../src/layout.cpp
 	../src/version.cpp
 	../src/node.cpp
+	../src/node_about.cpp
 	../src/node_border.cpp
 	../src/node_button.cpp
 	../src/node_button_custom.cpp