refactore http listener creation

replace linkedlist with arraylist in the expression parser

update ucx

expression parser: add support for functions

redirect stdout/stderr to log file

use non-blocking IO for pipes and socket in send_cgi

add http_send_response function that is usable for non-blocking IO

parse cgi stderr output for logging and use non-blocking pipes

refactor send_cgi into non-blocking SAF (wip)

fix prepare_service_file error handling

improve error handling in send_file if the file is a directory

add check if pidfile can be opened

run Init directives after setuid

make config parser delimiters configurable

allow '-' in tokens, add support for negative integers

add obj.conf expression parser

(0) -300 -100 -16 +16 +100 tip

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