Add Swiss French and German keyboard layouts.

There used to be two "Swiss" keyboard layouts, labelled fr_CH and de_QY,
available in LatinIME. They were, however, not actually Swiss layouts
but instead work-arounds to be able to get French or German with qwertz
or qwerty (instead of azerty and qwertz) layouts, respectively. These
were thus removed by commit f6972561
replacing them with the generic fr-qwertz and de-qwerty layouts instead.

Here, now, is a proper Swiss keyboard layout, following Swiss standards
for people accustomed to typing on Swiss keyboards, with the expected
tailorings for French and German.

Change-Id: I9feed752053ecc694c84db713284f69bc1daf155