Move both app code and data together.

Refactor app movement code into the normal install flow as a new
flavor of InstallArgs.  It copies both app code and data during the
copy step, and just updates paths during the rename step.

Measure free space before kicking off a move.  Spawn a thread to
derive a hacky progress estimate based on free disk space counting
down.

Remove checkFreeStorage() and getLegacyNativeLibraryPath() which
nobody was calling.  Fix deadlocks around package broadcasts, and fix
wrong lock ordering when loading packages.

Bug: 19993667, 20275578, 20370140
Change-Id: I7bbf14c924a724d6ebb8a41a02434750fa3302bc