Fix bug in applying line bounds from symbol in TextField
Cleanup of SharedObject reftest

Mostly, this is a *very* rough port of the ZombotronTest SharedObject test coverage.
Remove the ZombotronTest tracetest

It tested a collection of varied functionality, all of which is covered by other tests. ( Well, all except for `TextField#appendText`, which we don't currently implement :( )
Merge pull request #1607 from tschneidereit/master

More tracetest cleanup and fixes