Draft: [fix_extract] Not working first attempts to fix the extract feature

[Rauldg]

pocolog <input_log.log> --extract <output_log.log> --stream <stream_name>:ini_index:end_index

Is not working. It seems like the classes that ExtractConfig uses have been updated but the ExtractConfig itself not. This is what I deduce since the method each_block does not exist for objects of the type Logfiles. It could be that I am passing the parameters in the wrong order but I could not find the method each_block implemented for any other pocolog class, so I think that the parameter order is correct.

Steps to reproduce

Download this log containing streams from various tasks and place it under pocolog/test/data then run:

pocolog test/data/laser_scanner_Logger.0.log --extract test/data/sample_velodyne_only.log --stream velodyne.laser_scans:0:5

This is the complete output:

pocolog.rb[INFO]: building index test/data/laser_scanner_Logger.0.log ...
pocolog.rb[INFO]: done
Traceback (most recent call last):
        8: from /opt/workspace/tools/pocolog/bin/pocolog:715:in `<main>'
        7: from /opt/workspace/tools/pocolog/bin/pocolog:576:in `execute'
        6: from /opt/workspace/tools/pocolog/bin/pocolog:158:in `execute'
        5: from /opt/workspace/tools/pocolog/bin/pocolog:68:in `init'
        4: from /opt/workspace/tools/pocolog/bin/pocolog:68:in `open'
        3: from /opt/workspace/tools/pocolog/bin/pocolog:72:in `block in init'
        2: from /opt/workspace/tools/pocolog/bin/pocolog:166:in `block in execute'
        1: from /opt/workspace/tools/pocolog/bin/pocolog:166:in `each'
/opt/workspace/tools/pocolog/bin/pocolog:169:in `block (2 levels) in execute': undefined method `each_block' for #<Pocolog::Logfiles:0x0000557b7237e3d8> (NoMethodError)

I have tried to fix this on my own but I miss too much expertise on this library. Probably I am doing too many things wrong.

Anyone can help recovering this feature?