Kconfig and MicroPython config is not updated yet.
* start to refactor lv_conf.h
* further mem refactoring
* create lv_mem_builtin.c/h
* update lv_conf_internal.h
* add lv_strlen and lv_strncpy
* rename LV_DRAW_COMPLEX to LV_USE_DRAW_MASK
* update lv_conf_template
* minor fix
* feat(label): added animation style property to apply it to circular scrolling animation of label widget
Added an animation style property to be used as animation template for different use cases in different widgets.
This commit implements using this property to set the start and repeat delay of the circular scrolling animation of the label widget.
Closes#3097
* fix(label): changed animation style property's var_type to `const lv_anim_t *`
* example(label): added example showing how to customize circular scrolling animation
* chore(label): ran code-format.py and added missing function prototype to lv_example_widgets.h
* Fixes to micropython examples
Added missing images and fonts under 'assets'. Since .bin is in gitignore, renamed fonts to .fnt
* Update build_micropython workflow
Build the unix port dev variant and run tests.
See: https://github.com/lvgl/lv_binding_micropython/issues/151
