Fails to parse WAT with escaped string inside it

[paudsu01]

wabt.parseWat fails when the wat file contains a string that contains an escaped string.

Steps to reproduce:

1. Create a .wat file which contains an escaped " inside a string. For example, a file with the following content:

(module
  (data (;0;) (i32.const 0) "Hello\"world!")
)

2. Use the library to call parseWat