Bug fixes
- lv_line: set line.width ext. size to not trim parts on x = 0, y = 0 coordinates
- lv_conf.h: add LV_COMPILER_VLA_SUPPORTED
- lv_group_create: init focus_cb
- fix of 16 bit image drawing with alpha bytes
- fix text opacity
- lv_mbox: enable navigation with LV_GROUP_KEY_DOWN/UP too
- lv_conf.h: add LV_COMPILER_VLA_SUPPORTED
- lv_slider: inicator draw bugfix
- lv_slider: draw greater background on negative padding if knob_in == 1
- mono theme: fix typo
- style animations: add opacity handling to image, text and line
- lv_kb: before ok/close action don't deassign the lv_ta if there is user defined action
- in lv_objx_set_... functions apply the new value only if it's different from the current
- don't invalide hidden objects
- lv_group_del: remove the objects from the groups too