Update tabular artifact output to match import format

Fixes Partially addresses #126 (closed)

Description This merge request changes the tabular exports of artifacts to match the input format.

Type of PR This PR is a improvement.

Technicalities

• The internal implementation of ArtifactTableView has changed a bit, but should now be more readable and easier to extend to export search results.
• Some linked tables that ArtifactsController requires were uncommented, and I changed the formatting to make it more readable.

Tests

• Visit http://127.0.0.1:2354/artifacts/1.csv
• Compare against the comparable import file (slightly different data though): https://docs.google.com/spreadsheets/d/1IeguPg56epnw3rLxcVt6WHsHwlEUmglCZ31urcbGEyc/edit?usp=sharing

Checklist:

• My pull request has a descriptive title (not a vague title like "Update index.md").
• My pull request targets the phoenix/develop branch of the repository.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.