Process Objectives

[renatomassaro]

Closes #266

• [x] Add Process.Objective
• [x] Tests
• [x] Docs
• [x] Add FileFactor
• Add ServerFactor for resources fact. Postponed
• Adapt existing processes. See *

TODO

• As long as we are here, rename ProcessType to ProcessData or (better) Processable. See *

Incidental

• As a sample application, FileTransferProcess has been updated to use the new Process.Objective

* These process-related refactors will be done on the next PR since it's quite big.

---

This change is 

[sourcelevel-bot[bot]]

Ebert has finished reviewing this Pull Request and has found:

• 1 fixed issue! 🎉

You can see more details about this review at https://ebertapp.io/github/HackerExperience/Helix/pulls/307.

[renatomassaro]

Reviewed 14 of 14 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

---

Comments from Reviewable