Fix String Escaping with Back Slash

[cernec1999]

Currently, string escaping doesn't work properly with slashes (and perhaps some other cases as well). This can clearly be seen with the following code:

temp.test = "\\";
player.chat = temp.test;

Result:

The intended result is one back slash.

In addition, we get a compilation error with this payload:

temp.test = "a";
if (temp.test == "\\") {
  player.chat = "hi";
}

The response that the compiler spits back is:

malformed input at line 2: if (temp.test == "\\") {