General improvements to commands and reporting

• Add CL option to back-date the insert time entry on add
• Add -y, --yesterday to add command to allow adding to the previous day
• Change the get most recent to accept an entryDate
• Add ability to edit the logged time on an entry
• Add percentages after the hours in the summary section of the report
• Addition of inquirer-autocomplete-prompt for the project and time type lists
• Switch all use of process.exit to try/catch (make unit testing possible)
• Backdating improvements
  • subtract backdate time from minutes since last entry/default minutes
  • display the effective logging time when using backdating (always?)
• Fix bug with edit where errors out when using --last on a day with no entries