Most of RosterWindow's special functions have been split into a special
BGroupView (including both the roster search-box and roster list),
RosterView.
This will give some more flexibility in other uses of the roster list.
In addition, RosterViews can be tied to a specific account by its
looper's instance ID, allowing it to either show all contacts (globally;
if the ID is set to -1) or only those of the specified account.
This can be useful, for example, when inviting contacts to a room―
you can only invite contacts that use the same protocol, and are
associated with your account, so showing all contacts doesn't make
sense.
The SearchBarTextControl class was removed, as it isn't particularly
necessary.
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