keymap: fix sixaxis gamepad keymapping

Values below starting at 256 are reserved for KEY_BUTTON_*,
use some other unused key id for the GUIDE button. This button
is only virtual since it's mapped from a CEC event
jni: consmetic refactor to consistent appearance
jni: fixed build, these do not exist here
cosmetics: correct typo in DVDPlayerCodec.cpp
Merge pull request #2914 from manio/patch-1

cosmetics: correct typo in DVDPlayerCodec.cpp
[release] version bump to 13.0 alpha6 as we start new merge window.
Merge pull request #2915 from MartijnKaijser/bump

[release] version bump to 13.0 alpha6 as we start new merge window.
[AEChannelInfo] The condition should be a conjunction.

This additionally reverts commit add8fab77bd3a646569164a79d96f1ee2b57ac0f.
[CoreAudio/IOS]  Assignment of function parameter has no effect outside the function.
[Cores] Style: Reduce scope of variables.
[PulseAESound] Correct oder of initializer list.
[Cores] Silence message "Checking if unsigned variable ... is less than zero".
[LinuxRendererGL(ES)]Consecutive return statements are unnecessary.
[CrystalHD/OpenMax] Make the classes non-copyable.
[Sinks] Function parameter 'format' should be passed by reference.
[DVDInputStreamNavigator] Pass function parameter by reference.
[Cores] Prefix ++/-- operators should be preferred for non-primitive types.
[DVDAudio] Common realloc mistake: 'm_pBuffer' nulled but not freed upon failure.