Replace original tag classes with classes in the tags package.
I removed all of the original tag classes and tests. There are still a few
things that need to be done after this commit:
- The tags package doesn't have a class to represent a tag value yet, so I used
Object instead of TagValue in the ViewData API.
- There are no methods for manipulating the current TagContext yet, since #498
hasn't been merged. I couldn't update StatsRunner, so I temporarily commented
most of it out.
- We need to add a StatsRecorder.record method that uses the current context.
39 files changed
