Replace Link with Snapshot (WIP)

[cdvv7788]

Summary

Use Snapshot everywhere, instead of the old Link schema. This is a work in progress, and most likely unstable at this point.

Changes these areas

• Bugfixes
• Feature behavior
• Command line interface
• Configuration options
• Internal architecture
• Snapshot data layout on disk

[cdvv7788]

Extractors are working using snapshot only. Pending:

• HTML index is disabled at the moment. Refactor pending
• All of the parsers (except the base txt one) are still using link
• The generated index detail may be inconsistent with previous versions. Need to check this in detail before proceeding
• Only add and init commands tested so far. Need to work on the other commands.

[cdvv7788]

Most commands are functional now. There are issues with what some of them return, but they don't raise any issue when running them:

• Add is still using parsers that require links
• Init is not correctly recreating the folders that are not in the main index but are in the filesystem
• Status is not displaying the right status for everything
• Server is returning a 500 error (with nothing being shown in the console)

Fixing these issues is what I am working on at the moment.

[cdvv7788]

The most obvious issues are fixed now. All of the commands are partially functional. Now I will focus on:

• Getting the tests running
• Restore the html-related functionalities
• Find a good way to handle tags with the new structure
• Make sure that the index is correct when compared with the previous version

[pirate]

Whoops closing this was not intentional, it auto-closed when v0.5.0 was deleted after merging. @cdvv7788 do you mind re-opening this against dev (and any other of your PRs that were against v0.5.0)