Added build date (ro.build.date from build.prop) to device info.

Change-Id: I5e19ee04de5c26822e171d4af8f4bfc052be9b74

Conflicts:
	res/values/liquid_strings.xml
	res/xml/device_info_settings.xml
	src/com/android/settings/DeviceInfoSettings.java
About;Software Info; Reduced taps from 7 to 3 for developer options

Change-Id: I8fc855ea6d833723ccd43b5f75d827a18eadff61
(2/2) Parse plain-tweak values to add into About screen

Change-Id: Ib87bdec9e7fa02238f405dbee1af0deb7a4f360e