* test(bar) Add test for docummented default attributes
* test(bar) Update test for docummented default attributes
* test(bar): Indicator width tracks value
* test(bar) Calculate bar indicator width based on its style
Take padding, max value and bar value into consideraion
* test(bar) Indicator area gets smaller when increasing padding in LV_PART_MAIN style
* test(bar) Start value changes only when in range mode
* docs(bar): Add missing MODE to symbols
* test(bar) Start value should be smaller than current value
* test(bar): Test current value truncation to max and min value
* bar: Check bar mode in lv_bar_set_start_value
bar start_value can be changed only when bar is in LV_BAR_MODE_RANGE mode.
Return early when it's not.
* test(bar): Fix width calculation test
* bar: Initialize indic_area in constructor
* test(bar): Refactor indicator coordinate update test
* test(bar): Indicator negative value in symmetrical mode
* test(bar): Fix base direction
* test(bar): Indicator coord test for RTL base dir
Add lv_<widget>_draw_part_type_t to widgets to precisly describe the hooked drawings.
Also add class_p element to lv_obj_draw_part_dsc_t to show what widgets lv_<widget>_draw_part_type_t needs to be used.
Related to: https://forum.lvgl.io/t/how-to-add-minor-division-lines-to-a-chart/5366/
