Bug: 5447495
Change-Id: Iffb09895676c3dd1a79d1699b0eac865282508d4

This is a preparative change for inserting the spell checker.

Change-Id: Ie441879cac4f67078ec27a95f1fcbbf3ef373df7

Bug: 5062425
Change-Id: I025991424de40c2b31b90238f99ef160e7efd92e

None of these are expected to actually be null, but those are
included for peace of mind and foolproofing against future
code changes.

Bug: 4580040
Change-Id: Ib112b3e5db5f177aaf61767164b7e78d711f90a0

This improves performance by not allocating an iterator.

Change-Id: I5511fd8b8d3aa826917620c0af994dbaf1562bb1

This change enables the interface to get multiple dictionaries from a
dictionary pack. It only implements it to the end in the case of the
proprietary method, as the open method needs still some working out,
and the "inside the package" method does not need it.

This change goes together with Iaa95bf36, and breaks the build
without it.

Bug: 1752028

Change-Id: I3ccfd696e8ef083ef9c074e1c3e4bb0bf2fcfd23

The dictionary collection is a class complying to the Dictionary
interface that acts as a front end to a collection of arbitrarily many
dictionaries of any type.
The dictionary factory is a helper class for creating various
dictionaries and get some meta information about them.

At the same time, this change makes the BinaryDictionary class
not a singleton any more.

This also needs I9afe61a9 to not break the build.

Change-Id: I61fdcc4867fcda18342807bf1865e6e46979e5d5