Show current and new version in install dialog

This change will add a new tab to the install/update dialog that will
show the current and new version of the app.

Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>

Conflicts:
	res/values-de/strings.xml
	res/values/strings.xml
	src/com/android/packageinstaller/PackageInstallerActivity.java

Change-Id: Ie69bf5608883f133c782dcf6f47fac5b9481ad1a
Signed-off-by: DHOMD <DHO@dho.im>