FamitrackerTextFile.cs relies on comments when parsing FamiTracker text export

[Gumball2415]

Lines beginning with # are ignored as comments in FamiTracker text import. They are not guaranteed to remain consistent or even appear in later versions of FamiTracker and its derivative forks.

if (headerLine.StartsWith("# FamiTracker text export")) breaks upon changes with the generated comments in Dn-FamiTracker 0.5.0.0+.

[BleuBleu]

No plans to improve famitracker support in the future. 0.4.6 will be as far as I will go and this version consistently had the header.

Also, I remember someone else opening an issue about this! #47

-Mat