add gallery toggle

lib/app/AppGLFW.cpp

@@ -3,7 +3,7 @@
 #include "imgui.h"
 #include "imgui_impl_glfw.h"
 #include "imgui_impl_opengl3.h"
-#include "uiresources_app.h"
+#include "app_resources_default.h"
 
 static void glfw_error_callback(int error, const char* description)
 {

lib/app/CMakeLists.txt

@@ -1,6 +1,6 @@
 set(PIXELARIUM_TITLE ${CMAKE_PROJECT_NAME})
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/uiresources_app.h.in
-  ${CMAKE_BINARY_DIR}/uiresources_app.h @ONLY)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/app_resources_default.h.in
+  ${CMAKE_BINARY_DIR}/app_resources_default.h @ONLY)
 
 set(APPLIBSRC
   AppGLFW.cpp