MESS doesn't recognize `@include` directive in .ted files

[mfaizsyahmi]

I want to add base classes to a .ted file. For DRY and reusability reasons, I decided to place it in a separate file called HLBase.fgd which is placed beside mess.fgd. I added @include "HLBase.fgd" into one of the .ted files but mess' ted compiler throws up with an error.

MESS should at least pass through @include directives in .ted files into the fgd with a warning, until proper support is added.