Split display_buffer sub-components into own files (#4950)

* Split display_buffer sub-components into own files

Move the Image, Animation and Font classes to their own h/cpp pairs,
instead of having everything into the display_buffer h/cpp files.

* Fixed COLOR_ON duplicate definition

esphome/components/display/animation.h

@@ -0,0 +1,37 @@
+#pragma once
+#include "image.h"
+
+namespace esphome {
+namespace display {
+
+class Animation : public Image {
+ public:
+  Animation(const uint8_t *data_start, int width, int height, uint32_t animation_frame_count, ImageType type);
+
+  uint32_t get_animation_frame_count() const;
+  int get_current_frame() const;
+  void next_frame();
+  void prev_frame();
+
+  /** Selects a specific frame within the animation.
+   *
+   * @param frame If possitive, advance to the frame. If negative, recede to that frame from the end frame.
+   */
+  void set_frame(int frame);
+
+  void set_loop(uint32_t start_frame, uint32_t end_frame, int count);
+
+ protected:
+  void update_data_start_();
+
+  const uint8_t *animation_data_start_;
+  int current_frame_;
+  uint32_t animation_frame_count_;
+  uint32_t loop_start_frame_;
+  uint32_t loop_end_frame_;
+  int loop_count_;
+  int loop_current_iteration_;
+};
+
+}  // namespace display
+}  // namespace esphome