Parser does not correctly read files that are encoded with UTF-8 with BOM

[Laupetin]

Even though the usage of UTF-8 BOMs is not recommended by the unicode standard ("Use of a BOM is neither required nor recommended for UTF-8"), some software still love to create files that make use of it.
While OAT does not dump files with a BOM itself, it should be able to handle one if encountered.

See also: https://en.wikipedia.org/wiki/Byte_order_mark