Remove unused includes and clean up header files

src/app/gui/color.cc

@@ -1,9 +1,5 @@
 #include "color.h"
 
-#include <cmath>
-#include <string>
-
-#include "app/gfx/bitmap.h"
 #include "app/gfx/snes_color.h"
 #include "app/gfx/snes_palette.h"
 #include "imgui/imgui.h"
@@ -168,5 +164,4 @@ void SelectablePalettePipeline(uint64_t& palette_id, bool& refresh_graphics,
 }
 
 }  // namespace gui
-
 }  // namespace yaze

src/app/gui/input.cc

@@ -1,7 +1,6 @@
 #include "input.h"
 
 #include <functional>
-#include <optional>
 #include <string>
 
 #include "absl/strings/string_view.h"