Prioritize Block Application

[mvandeberg]

Resolves #229

Brief description

Renames BlockApplicator to Applicator and now also handles transaction application. The Applicator class prioritizes block application over transaction application.

Checklist

• [X] I have built this pull request locally
• [X] I have ran the unit tests locally
• [X] I have manually tested this pull request
• [X] I have reviewed my pull request
• [ ] I have added any relevant tests

Demonstration