This lets us sort by the underlying integers while only displaying the
icons. Currently, in both DolphinQt and DolphinQt2, we display both the
icon and the integer, but cut off the column width to not show the
integer. We also currently sort by the size's formatted string, not by
the size itself, which leads to "1 MB" sorting to less than "2 KB". This
commit fixes these issues.
In the future, we can use the filter methods here to allow for
searching for games.
