add chunk.sh shell script that returns cut of the file
based on starting line, number of lines to read
and direction (up or down)

add ChunkExtractor module that sanitizes params and handles response of
the chunk.sh script

add a json endpoint to be able to request chunks

simplify the logic, get rid of direction parameter
now it only tries to retrieve the chunk from the top to the down
got rid of direction param and custom chunk.sh script
use shell sed command

…o render the chunk

…m :all_files instead of empty list for unpacking all files)

Co-authored-by: Eric Meadows-Jönsson <[email protected]>