add some missed includes

Firmware/sdk/library/include_public/Event.hpp

@@ -12,6 +12,8 @@
 #include <mutex>
 #include <optional>
 #include <type_traits>
+#include <variant>
+#include <functional>
 
 enum class EventHandlingResult { DONE, IGNORE, CONTINUE };
 

Firmware/sdk/library/include_public/Fonts.hpp

@@ -5,6 +5,7 @@
 #ifndef CB_SDK_FONTS_HPP
 #define CB_SDK_FONTS_HPP
 
+#include <cstdint>
 #include <array>
 
 // Terminess Powerline

Firmware/sdk/library/include_public/Surface.hpp

@@ -5,6 +5,7 @@
 #ifndef SURFACE_HPP
 #define SURFACE_HPP
 
+#include <cassert>
 #include <memory>
 #include <type_traits>