lv_bidi_process_paragraph() function
Bidi process a paragraph of text
Arguments
str_in
the string to process
str_out
store the result here
base_dir
base dir of the text
pos_conv_out
an `uint16_t` array to store the related logical position of the character. Can be `NULL` is unused
pos_conv_len
length of `pos_conv_out` in element count