[1/2] Speed up booting on multicore devices.

1. Add multithreading support to Installer/installd.
2. Parallelize package scanning.
3. Parallelize boot dexopt.

Change-Id: Id42b2bf4a737f93f9ecd9b5819344adbb735f0fb
base: LT translations

Minor fixes, additional string have been translated
*Additional strings have been translated

Change-Id: Id1b3806d0e7df4beb1977b393d05307f86939e8b