[TASK] Simplified custom torrent parser

[shad7]

The custom torrent parser that was in use had extra methods that were not needed and the code was more complex than necessary. Removed the extra methods and the inner class, and created simple Bdecode class that handles parsing a proper torrent file.

Added test cases to make sure custom parser is completely tested and follows the entire torrent spec.

[landscape-bot]

Repository health decreased by 0.41% when pulling 4c438c5 on task/misc into f8d40d5 on develop.

• 6 new problems were found (including 0 errors and 3 code smells).
• 1 problem was fixed (including 0 errors and 1 code smell).

[landscape-bot]

Repository health increased by 0.09% when pulling bd75adc on task/misc into f8d40d5 on develop.

• No new problems were introduced.
• 1 problem was fixed (including 0 errors and 1 code smell).

[shad7]

Review status: all files reviewed, all discussions resolved, some commit checks pending. Reviewed files:

• etc/seedbox/logging.cfg @ r1
• seedbox/tests/torrent/test_loader.py @ r1
• seedbox/tests/torrent/test_parser.py @ r1
• seedbox/torrent/loader.py @ r1
• seedbox/torrent/parser.py @ r1

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Comments from the review on Reviewable.io