Fix 'SWT Resource was not properly disposed' errors on client startup

## Where?
IBEX Client

## How?
When running `ibex.product` from eclipse, I get some errors in my console claiming "`SWT Resource was not properly disposed`".
These resources should be identified and properly disposed of.

## Acceptance criteria
- [ ] Problematic resources as identified and appropriately disposed of.

## How to Test
_verbose instructions for reviewer to test changes
(**Add before making a PR**)_