Add ApplicationRunningContext class

Add ApplicationRunningContext class

ApplicationRunningContext has dynamic informations of application such
as app state, process id.
Some properties of ApplicationInfo class is removed or moved into
ApplicationRunningContext class.

Now ApplicationManager.GetRunningApplicationsAsync returns a list of
ApplicationRunningContext and ApplicationLaunched/Terminated event
passes ApplicationRunningContext class.

Change-Id: Iab37846028d0f04de3a4de419cd4b923c3f0644e
Signed-off-by: Sangyoon Jang <s89.jang@samsung.com>