changing the generated grammar into the new sdf3 style
dropped old sdf2 tools and use Ant Macros in the new targets
using the new signatures library
fix folder discovery when packing esv files
show error dialog when trying to apply a builder when there are error markers in the file
Merge pull request #9 from metaborg/sdf3-changes

Changes in the generator due to the new SDF3 implementation.
Show error dialog when trying to apply a builder when there are errors markers in the file.