Fix: Marking ticks and mixed configs (fixes #148)

[oliverfoster]

fixes #148

Fix

• Marking ticks and mixed configs

Testing

"_answers": [
        ["alpha", "a"],
        ["beta", "b"],
        ["gamma"],
        ["delta", "d"]
    ],
    "_items": [
      {
        "prefix": "pref1",
        "suffix": "suff1",
        "placeholder": "Enter answer here1"
      },
      {
        "prefix": "pref2",
        "suffix": "suff2",
        "placeholder": "Enter answer here2"
      },
      {
        "_answers": [
          "tom",
          "t"
        ],
        "prefix": "pref3",
        "suffix": "suff3",
        "placeholder": "Enter answer here3"
      },
      {
        "prefix": "pref4",
        "suffix": "suff4",
        "placeholder": "Enter answer here4"
      }
    ],

Should show image below (minus correct answer display):

[kirsty-hames]

With the assumption that "gamma" is no longer an acceptable answer for item 3 because answers "t" and "tom" override this. This is working as expected thanks.

[oliverfoster]

With the assumption that "gamma" is no longer an acceptable answer for item 3 because answers "t" and "tom" override this. This is working as expected thanks.

I used this comment as guidance

adapt-contrib-textInput/js/textInputModel.js

Line 131 in d7a9385

// Marks any items which have answers specific to it

The rationale is that item specified answers override component specified answers.