Refactoring: Renaming Pascal-cased files to snake-cased files

src/level.cpp

@@ -5,7 +5,7 @@
 #include <iostream>
 #include <string>
 #include "ui/pausemenu.hpp"
-#include "ui/ContextMenu.hpp"
+#include "ui/contextmenu.hpp"
 
 namespace advanced_wars {
 

src/level.hpp

@@ -7,7 +7,7 @@
 #include <SDL.h>
 #include <string>
 #include <vector>
-#include "ui/ContextMenu.hpp"
+#include "ui/contextmenu.hpp"
 
 namespace advanced_wars {
 

src/main.cpp

 #include "engine.hpp"
 #include "spritesheet.hpp"
-#include "ui/Menu.hpp"
-#include "ui/ContextMenu.hpp"
+#include "ui/menu.hpp"
+#include "ui/contextmenu.hpp"
 #include "window.hpp"
 #include <memory>
 

src/ui/ContextMenu.cpp → src/ui/contextmenu.cpp

-#include "ContextMenu.hpp"
+#include "contextmenu.hpp"
 #include <iostream>
 #include <SDL_ttf.h>
 

src/ui/Menu.cpp → src/ui/menu.cpp

-#include "Menu.hpp"
+#include "menu.hpp"
 #include <SDL.h>
 #include <SDL_image.h>
 #include <SDL_ttf.h>