projectmanager/apt-cache: enable filtering on section

for package list retrival

Signed-off-by: Manuel Traut <manut@linutronix.de>
add a private_data field to elbeproject class

this can be used for custom data of a project handler

Signed-off-by: Manuel Traut <manut@linutronix.de>
asciidoclog log STDIN if given

Signed-off-by: Manuel Traut <manut@linutronix.de>