packaging: Initial packaging of Weston 1.6 IVI Shell for Tizen

Squashed all of the older packaging changes into a single
initialization commit, as the Weston 1.6 rebase will bring us
to a clean slate in any case.

Now depends on Weston 1.6, as well as libwayland-client and
libwayland-server 1.6. Version has been bumped to 0.1.8.
Base for the IVI Shell patches is Nobuhiko Tanibata's
upstream branch weston-ivi-shell-1.6.0-WIP-12.

squashed Weston 1.5 IVI Shell commits:

8117bcf - packaging: Intial packaging for Tizen on 1.5.0
115867c - packaging: use upstream tag
c2c742f - packaging: dont overload regular weston files
5fe3ac7 - packaging: update config
ec16a2a - packaging: enabled desktopshell
7520753 - packaging: install ivi headers
b373015 - packaging: Build weston-clients to weston-ivi-shell
0ba60de - packaging: Bump to 0.1.7
a69fec0 - Revert "packaging: use upstream tag"
90fb16f - packaging: fix client installing pathes

Change-Id: I1c68d769c16c3e6a7c2445ce4e5034601aa2ea7d