Squish: Clean up Object Map

## Where?
System_Test_UI_E4/objects.map, Squish -> Object Map.

## How?
It has been noticed that the object map in Squish has many incorrectly or poorly named objects. As a result, the object map seems to be a bit of a mess. Additionally, the structure of the map could be improved and reorganized in a more logical manner. Object names should be replaced to reflect what the items are, and the map should be reorganized with objects being 'nested' into the appropriate place.

## Acceptance criteria
- The object map has been cleaned up and reorganized, if and where appropriate.
- The Squish tests that currently exist run without error.

## How to Test
Once the alterations have been made, rerun all the Squish tests on a machine.