Move TM and ATM entry metadata to third line, use QListWidget instead of QTextBrowser for entries

The same data is displayed per translation memory (TM) or alternate translation memory (ATM) entry, but the data is ordered differently and formatted better. An entry begins with metadata containing up to percentage match, number of occurrences, and keyboard shortcut. The source and / or target strings follow in a bullet point list. If the sources match by >=95% then the N% match is in bold to indicate a good match, on 100% match it says "perfect match" as well as a percentage. If there is no keyboard shortcut associated with the entry then no shortcut info is shown, rather than an empty placeholder. Proper Qt lists are used for the entry items now rather than a text document. Where the ATM displays further details about the current translation rather than a translation from the alternate translation file, the ATM entry displays the details in the same format as the Unit Metadata window.