222 refactor scalability and outputs

[JavierCladellas]

• Closes refactor scalability and outputs #222
• Closes Clean application outputs #205

Done:

• Refactored scalability: There is no longer a outputs field, nor an OutputsHandler.
• Refactored the code that copies partials (now on AppSetup
• Created an Extractor Factory for extracting performance variables from different file formats (currently: json, csv, tsv [toolbox specific] ) .
• For perfvars in json files, the use of multiple wildcards (*) is now supported. [This is huge for handling KUB timers]
• Now users can specify custom units. The syntax is :

  "format":"csv"
  "units": {
    "*": "s",
    "my-column" : "my-special-unit"
  }
}

Implying that all columns on the csv will have "s" as unit, except the column my-column, which will have "my-special-unit" as unit.

• Add option to scalability field to cleanup scalability directory after test: clean_directory. (defaults to false)

❗ Merge after #215 ❗

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