Feature/new viewer

[meganrm]

Installs the updated viewer with new features:

1. Reset button
2. Drag and drop doesn't auto play
3. Drag and drop playhead updates
4. Left (regular ) click selects an agent. Clicking on the background deselects.
   https://aicsjira.corp.alleninstitute.org/browse/AGENTVIZ-871
   Pull request recommendations:

• Name your pull request your-development-type/short-description. Ex: feature/read-tiff-files
• Link to any relevant issue in the PR description. Ex: Resolves [gh-##], adds tiff file format support
• Provide description and context of changes.
• Provide relevant tests for your feature or bug fix.
• Provide or update documentation for any feature added by your pull request.

Thanks for contributing!