Hardware key custom rebinding (1/2)

Framework changes to allow rebinding of the actions performed on the following
key press events: Home long-press, menu press, menu long-press, search press,
search long-press, app-switch press and app-switch long-press.

The available actions are: Nothing, open/close menu, recent apps switcher,
search assistant, voice search and in-app search.

Patch Set 1: Initial port from ICS [done by Konstantin Koslowski]
Patch Set 2: Added 'assist' (search) key customisation
             Option for ICS-style in-app search, in addition to jellybean-style
             search assistant.
             Fixed double haptic feedback on virtual key press.
Patch Set 3: Checkbox to enable/disable all custom bindings.
             Home long-press defaults to no action on devices with
             an app-switch key.
Patch Set 4: The recent apps list will be preloaded on the initial down press
             of whichever key to which it is bound.
Patch Set 5: Fixed menu virtual key press sometimes performing the custom
             action bound to the menu key instead of just opening or closing
             the menu as it should.

Conflicts:
	core/res/res/values/public.xml
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

Change-Id: I72c0d220a09d79230bfa299e0521ed693e5c25f1

Conflicts:

	core/java/android/provider/Settings.java
	core/res/res/values/config.xml
	core/res/res/values/symbols.xml

Conflicts:

	core/java/android/provider/Settings.java
Enable custom actions for double-tap home (1/2)

Change-Id: I041e7ab3853b356ddbdab2524f096546319276f9
Detect whether overflow button should be shown based on menu key state

Some devices may have hardware keys but not contain a hardware menu key.
Hardware keys are also able to remapped. The overflow button detection logic
currently does not take that into account. This change allows detects
whether any key is capable of emitting the MENU_ACTION keystroke in
order to determine whether the overflow button should be shown or not.

Change-Id: I8699bd0242560314f8eadc54b187c69c992cf875