This commit makes some clean-up to the debian/ packaging directory.
Most importantly, the dependency to libqt5svg5 was added to ensure
that the icons are correctly displayed on all systems.
Signed-off-by: Boyuan Yang <byang@debian.org>
With this commit, I would expect users able to build deb packages
with instructions that is compatible from Ubuntu 16.04.x LTS.
Signed-off-by: Boyuan Yang <073plan@gmail.com>