Major changes to validation system in EditTrack.
Major changes to validation system in EditTrack.

* Add EditTrack.getRefSeq.
* All view-store helpers take a callback now.

We are now able to:
* Call setORF before validations are run.
* Maintain highlighting of an exon after resizing.

Additionally,
* Fix undo redo that was broken from SHA: 18606d9d.

Signed-off-by: Anurag Priyam <6e6ab5ea9cb59fe7c35d2a1fc74443577eb60635@gmail.com>

wurmlab/afra,wurmlab/afra,kimrutherford/afra,kimrutherford/afra,kimrutherford/afra,kimrutherford/afra,kimrutherford/afra,wurmlab/afra,wurmlab/afra