add new features in homescreen-service and homescreen

add new features in homescreen-service and homescreen

homescreen-service: add five verbs.
1.showWindow: instead of tap_shortcut and show onscreen.
2.hideWindow: used when want to hide onscreen.
3.replyShowWindow: used when post onscreen reply information to application.
4.showNotification: used by application who want to display notification on homescreen top area.
5.showInformation: used by application who want to display information on homescreen botton area.

homescreen:
display notification and information.

Bug-AGL: SPEC-1931

Change-Id: Ia17a9793c5d284458009ea71eb9594a40286fa8c
Signed-off-by: wang_zhiqiang <wang_zhiqiang@dl.cn.nexty-ele.com>