Twarc-csv

Small change to add an extra bookmarks_count field.

Small bug fix to not crash when `entities` are missing in a tweet.

This new version changes the CSV format significantly since the previous one:

* Added extra fields for usernames (`in_reply_to_username`, `retweeted_username`, `quoted_username`) previously these were IDs only.
* Process entities by default (extract expanded URLs, json objects with indexes for hashtags and mentions are now just lists)
* Add new command line option `--process-entities` to turn this off
* New twitter data field for users: `verified_type`
* Rearranged the order of output columns in the CSV which may affect some things too.

Added new columns to support edited tweets, and missing rule match column for streamed tweets.

New version adds ability to convert lists, and validates output columns.

Fix package not including modules and Readme.