chore: update some code and docs to use v9 API #5876
Merged
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Description of the feature or fix
update most of the remaining code (including demos, examples and tests) and docs using the old API in lv_api_map_v8.h to v9 API
i keep the code using lv_obj_move_foreground and lv_obj_move_background untouched because i think these APIs are nice and easy to use
Notes
lv_conf_template.h
run lv_conf_internal_gen.py and update Kconfig.scripts/code-format.py
(astyle version v3.4.10 needs to be installed) and follow the Code Conventions.