allow ThatIs filter to take multivalued options (BC BREAK)

[CircleCode]

this fix allows to add a condition for staged files contains a php file from either directory foo or bar in the form

"conditions": [
  {
    "exec": "\\CaptainHook\\App\\Hook\\Condition\\FileStaged\\ThatIs",
    "args": [
      {
        "ofType": "php",
        "inDirectory": ["foo/", "bar/"]
      }
    ]
  }
]

:warning: :warning: :warning: this also contains a minor (IMHO) BC break: :warning: :warning: :warning:

• before, the inDirectory filter would return true if the directory is any part of the file path or name (for example, "inDirectory": "foo/" was true for foo/bar.php (OK), bar/foo/bar.php (KO)
• after, the directory must be the start of the path relative to git dir

@sebastianfeldmann do not hesitate to update or reject this PR if you disagree with it

[CircleCode]

@sebastianfeldmann let me fix CS, sorry, I always forget this is not in pre-commit hook ;-)