Qt: (Debugger) Add ability to remove result from Memory Search results

[Daniel-McCarthy]

Description of Changes

Adds the ability to remove individual search results from the Memory Search results list. Right clicking a result will give the "Remove Result" option in the context menu.

Rationale behind Changes

Especially with large lists of results, it's helpful to be able to filter out addresses that we know we're not interested in. Primarily a convenience feature.

Suggested Testing Steps

• Open a game and the debugger.
• Perform a memory search.
• Right click any result, click 'Remove Result'.
• Verify it's no longer in the list, and does not reappear upon a filter search (ensures it's not just gone from the UI, but our internal results set).

Safe guards are in place to make sure the value being replaced is the one you selected.