Use StringStream to build large strings

If building strings, use a StringStream value to accumulate the string and then convert to a string.

Each string addition creates a new string.

FOR EXAMPLE:

``` a ="AAA" b = a + a + a +a + a + a --Creates 6 strings of length 3, 6, 9, 12, 15, 18

```

``` a ="AAA" b = (a + a + a) + (a + a + a) --Creates 6 strings of length 3, 6, 9, 6, 9, 18

```

TEST CASES:

``` fn test5a = ( local a ="" for i = 1 to 100 do a += (i as string) )

```

``` fn test5b = ( local ss = stringstream"" for i = 1 to 100 do format "%"(i as string) to:ss ss as string )

```

``` fn test5c = ( local ss = stringstream"",fmt ="%" for i= 1 to 100 do format fmt (i as string) to:ss ss as string )

```

``` fn test5d = ( local ss = stringstream"",fmt ="%" for i = 1 to 100 do format fmt ito:ss ss as string )

```

FOR 100,000 ITERATIONS:

``` test5a() -- 58875 msec., 505 MB test5b() -- 54672 msec., 39.2 MB test5c() -- 41125 msec., 29.2 MB test5d() -- 13532 msec., 10.0 MB

```

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