Isolate platform SDK includes from app header

src/app.h

@@ -32,23 +32,23 @@ struct PlatformStoragePaths;
 }
 
 #if defined(__OBJC__) && defined(__IOS__)
-#import <Foundation/Foundation.h>
-#import "GameViewController.h"
-#import "AppDelegate.h"
+@class GameViewController;
+@class AppDelegate;
 #endif
 
 #if defined(__OBJC__) && defined(__OSX__)
-#import "main.h"
+@class View;
+@class AppOSX;
 #endif
 
 #ifdef __ANDROID__
-#include "main.h"
+struct android_app;
+struct engine;
 #endif
 
-#ifdef __LINUX__
-#include <GLFW/glfw3.h>
+#if __LINUX__ || __WEB__
+struct GLFWwindow;
 #endif
-
 struct VRController
 {
     enum class kButton : uint8_t

src/platform_legacy/legacy_platform_services.cpp

@@ -7,6 +7,7 @@
 #include "renderer_gl/opengl_capabilities.h"
 
 #ifdef __ANDROID__
+#include "main.h"
 void displayKeyboard(bool pShow);
 void android_async_lock();
 void android_async_swap();
@@ -18,16 +19,26 @@ void android_pick_file_save(std::function<void(std::string)> callback);
 std::string android_get_clipboard();
 bool android_set_clipboard(const std::string& s);
 #elif __APPLE__
+#include <Foundation/Foundation.h>
+#include "objc_utils.h"
+#ifdef __IOS__
+#include "AppDelegate.h"
+#include "GameViewController.h"
+#elif defined(__OSX__)
+#include "main.h"
+#endif
 void delete_all_files_in_path(const std::string& source_path);
 #ifdef __IOS__
 void save_image_library(const std::string& path);
 #endif
 #elif __LINUX__
+#include <GLFW/glfw3.h>
 #include <tinyfiledialogs.h>
 std::string linux_home_path();
 int mkpath(const std::string& dir, mode_t mode = DEFFILEMODE);
 void linux_update_fps(int frames);
 #elif __WEB__
+#include <GLFW/glfw3.h>
 void webgl_pick_file(std::function<void(std::string)> callback);
 void webgl_pick_file_save(
     const std::string& path,