Misc ItemTable visual improvements

[campb303]

Some small visual improvements should be made to the ItemTable:

• Render the table with its default component instead of a Paper to remove extraneous shadows.
• Render the table rows with their "small" variant. See MUI Table API props
• Increase visual weight of sorting indicators to make sorting easier to see
• Decrease spacing between related filter fields to make associations easier to see

[campb303]

React Table's useFlexLayout hook and the columns object's width attribute should be used to weight column widths by flex basis.

[wrigh393]

Of the above items, there were some that were easy fixes.

• Rendering the table with its default component was fixed by removing the component={Paper} prop from the TableContainer component

• Rendering the table rows "small" variant was fixed by adding the size="small" prop to the Table component

• To increase the visual weight of the sort indicators the inactive color was changed to a darker grey color and the active color to be the secondary color from the theme

Orginal sort indicator(No active sort)

Orginal sort indicator(Active sort)

Updated sort indicator(No active sort)

Updated sort indicator(Active sort)

• Decreasing the spacing between the sort indicators and filters the edge="start" prop to the IconButton component.

Without edge="start" prop

With edge="start" prop

[campb303]

Waiting for #155 to be merged.