Implement sessionStorage in VoterRegLookup

[SchaeStewart]

Description

Whenever a voter is selected in VoterRegLookup it is saved to the sessionStorage. When the component is mounted the saved selected voter is set in the component's state.

Related Issue

112

How Has This Been Tested?

On local machine

Screenshots (if appropriate):

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.