Update the lastest code from agl-service-homescreen-2017.
To impove homescreen-service's extensibility.
"Change homescreen-service from c project to c++ project"
Relative Commit: https://gerrit.automotivelinux.org/gerrit/#/c/16351/
Change-Id: Id7e50fa61fdfcff30f69588aa1da4d93695edfc1
Signed-off-by: zheng_wenlong <wenlong_zheng@nexty-ele.com>
Signed-off-by: wang_zhiqiang <wang_zhiqiang@dl.cn.nexty-ele.com>