[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
Revert "Added sahlnaskh arabic font and give it higher precedence than DroidNaskh"

This reverts commit aea94c1a973cb7113bb933d3765e7896bcb6e1cb.

Change-Id: Ifb42e403af60cc58cff09e07ecb110bb9939e8ab
Core: add ES translations thanks to @SensesXda
SystemUI: update ES translations thanks to @SensesXda