Improved custom font support #43
Description
There is a new feature of LVGL C library that looks very cool on version 7.4.0:
Add lv_font_load() function - Loads a lv_font_t object from a binary font file
Add lv_font_free() function - Frees the memory allocated by the lv_font_load() function
This would enable us to load a custom function completely safe.