Add system|signature permission for intercepting package launch.

The preLaunchCheck (add, remove) functions which allows an application to
perform any checks before the framework launches the app
needs to be a protected with a system|signature permission.
This change defines the permission and protects the functions with it.

Change-Id: Ib62e25b780df39c4a7d9d1e4eaf3fc98ffa4089c
PackageManager: Add configuration APIs for pre-launch checks

This change replaces overlays with an audited set() API, allowing
application with INTERCEPT_PACKAGE_LAUNCH permission to bootstrap
themselves.

Additionally, checks have been added to ensure that the custom prelaunch
check activity always resolves to a valid target.

Change-Id: I7f6be647fde3ce4ed699e6abfbe0392176ec96d3
Call recording encoder/format choice 3/3

PS1: Adds a user option between WB AMR (the default) or HE-AAC for the encoding
 of call recording audio. Also changes the output format of the file
 appropriately (WB AMR now uses the WB_AMR output format and HE_AAC chooses the
 MPEG_4 output. File extensions are adjust accordingly as well).

This was in reponse to people complaining the quality of call recording audio
 is poor. It's noticibly better using HE-AAC, but filesizes are larger.

PS2: Removed Whitespace

Change-Id: Iffcdd3ba6f9aa80e238bbcc5db51809a4721711e