Rule: Always use "var" for variable declarations

function fun() {
  function nested() {
    x = 42; // which 'x' - local or outer?
  }
  nested();
  print(x); // 42
}

if local, then code should be rewritten as:

function fun() {
  var x;
  function nested() {
    var x = 42;
  }
  nested();
  print(x);
}

if outer, then:

function fun() {
  var x;
  function nested() {
    x = 42;
  }
  nested();
  print(x);
}

depends upon

SONARPLUGINS-2541 Symbol table

SONARPLUGINS-1788 Provide JavaScript rule engine based on SSLR

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