Add setValueIf and setValueExpression into question

[andrewtelnov]

If a question name or variable or calculated name changed that used in question.setValueIf expression and it returns true then setValueExpression is executed and set the result into the question.value. If setValueExpression is empty then question.clearValue() will be called. You basically can use these properties instead of "setvalue" trigger and it works for matrices and dynamic panel.
Here are some examples of usage:
For root questions:

{
    elements: [{
      "name": "q1",
      "type": "text"
    },
    {
      "name": "q2",
      "type": "text",
      "setValueIf": "{q1} = 1",
      "setValueExpression": "{q1} + {q3}"
    },
    {
      "name": "q3",
      "type": "text"
    }
    ] }

For matrices:

{
    elements: [
      {
        type: "matrixdynamic",
        name: "matrix",
        rowCount: 1,
        columns: [
          { name: "q1", cellType: "text" },
          { name: "q2", cellType: "text", setValueIf: "{row.q1} = 1", setValueExpression: "{row.q1} + {row.q3}" },
          { name: "q3", cellType: "text" },
        ]
      }
    ]
  }

{
    elements: [
      {
        type: "paneldynamic",
        name: "panel",
        panelCount: 1,
        templateElements: [
          { name: "q1", type: "text" },
          { name: "q2", type: "text", setValueIf: "{panel.q1} = 1", setValueExpression: "{panel.q1} + {panel.q3}" },
          { name: "q3", type: "text" }
        ]
      }
    ]
  }