Methods for creating, adding and removing forums have been moved to the
`ForumManager`. In order to still handle removing forums properly, a
`RemoveForumHook` has been introduced.
Methods for sharing forums with all current and future contacts have
been removed along with the localGroup where this information was saved.
The `ShareForumActivity` now has the proper label.
The `SessionId` and the `ProtocolEngine` have been moved to the
`clients` package.
This addresses part of #322 and part of what has been discussed in #320.
This commit introduces an abstract `BaseContactListAdapter` which provides
most of the adapter logic. The original `ContactListAdapter` extends it to
show date and online status of the contacts.
The new `ContactChooserAdapter` which is used for introductions extends
the `ContactListAdapter` and adds logic for graying out contacts from
different identities than the currently used one.
A new `ContactSelectorAdapter` extends the `BaseContactListAdapter` and
allows to select multiple contacts. It offers a method to return a
collection of all selected `ContactId`s.
This commit also sneaks in an animation when the 'Share Forum' button
is clicked.
Closes#292
