Add dependencies as submodules

- Add submodule freetype
- Add submodule glfw3
- Add submodule glm
- Add submodule msdfgen-atlas-gen
- Add submodule msdfgen-core
- Add submodule msdfgen-ext
- Add submodule stb

CopiumEngine/src/copium/sampler/Font.cpp

@@ -4,8 +4,6 @@
 #include "copium/core/Vulkan.h"
 #include "copium/sampler/Image.h"
 
-#define MSDF_ATLAS_PUBLIC
-#define MSDFGEN_PUBLIC
 #include <msdf-atlas-gen/msdf-atlas-gen.h>
 
 namespace Copium

CopiumEngine/src/copium/sampler/Texture2D.cpp

@@ -4,7 +4,7 @@
 #include "copium/sampler/Image.h"
 
 #define STB_IMAGE_IMPLEMENTATION
-#include <stb/stb_image.h>
+#include <stb_image.h>
 
 #include <fstream>