UI - Display custom input variables

[wcgunter]

This PR adds the ability to see custom input variables for processes on the Processes page and the History page.

New:

• Added the 'Input Variables' column to the Processes page table to be able to quickly see what a process has launched with. Includes copy buttons to quickly copy the variable's value to your clipboard. Format: {variable-name} ({variable-type}): {variable-value}

• Added the 'Input Variable' table to the History page to provide a structured view of the variables a process launched with. Includes copy buttons to quickly copy the variable's value to your clipboard.

Changed / Fixed:

• Updated the automated test suite to fix currently failing tests
• Combined the buttons in the Processes page table into one cell.
• Removed the 'Initiator' column in the Processes page table (now part of 'Input Variables' column)

[jamesfwood]

Nice work!