Fix backslash in string (#6)

[PellSmit]

I tested script bellow:

string bad_string	= "/\/\onies!";

default {
    state_entry() {
        llOwnerSay(bad_string + "\;\t\\\"\n");
    }
}

It was compiled to:

// RaySilent.Issue#6.lslp 
// 2016-11-13 01:49:34 - LSLForge (0.1.9) generated
string bad_string = "//onies!";

default {

    state_entry() {
    llOwnerSay((bad_string + ";\t\\\"\n"));
  }
}