Comment 22 for bug 1430893

We just discussed this on #ubuntu-desktop - I think this is the plan

 - Add fcitx & friends to 'live' seed (dropping ibus-pinyin & others at the same time), so that it's installed in the live session (it needs to be started up before the session starts) but not in the target by default.
 - Add it to pkg_depends of language-selector (per #1431337), so that check-language-support -l zh_CN returns fcitx packages.
   + This will cause the installer to keep fcitx only when the selected language is Chinese, and remove it otherwise.
   + In installed systems, language-selector will prompt to install fcitx.
 - If necessary (not sure if it is), fix language-selector to select fcitx as IM for Chinese when there is no pre-existing configuration.
   + We don't try to change .xinputrc for existing users.

To test this effectively, we have to do the seed change - the rest can be done locally.

Not acking the FFe yet, but please (temporarily for now) go ahead with the above seed change.