Added option to show linked channels with changeable colored background
(default off)
AudioOutput: add an 'attenuate others' option for priority speakers.
TextToSpeech_macx: reimplement using NSSpeechSynthesizer.

Fixes Text-to-Speech not working on Mavericks and
avoids several deprecated API calls.
TextToSpeech_macx: fix 10.4 compatibility.

Remove @property and @synthesize to make the
code work on 10.4.

Also import AppKit.h to fix the build when
building without PCH support.
README.static.osx: remove Linux references.
TextToSpeech_macx: selectively conform to NSSpeechSynthesizerDelegate protocol.

MUSpeechSynthesizerPrivateHelper currently conforms to the
NSSpeechSynthesizerDelegate protocol, which was an informal
protocol prior to 10.6.

Our legacy universal builds currently use the ancient 10.5 SDK
and does not know of the NSSpeechSynthesizerDelegate protocol,
which was first introduced in the 10.6 SDK. Because of that, the
legacy universal build is currently broken.

To fix it, we change the code to only adhere to
NSSpeechSynthesizerDelegate via a class extension. This class
extension is only exposed to non-universal builds using the 10.6
SDK (or greater).
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/mumble/AudioOutput.cpp
Merge remote-tracking branch 'natenom/colored_linked_channels'

Conflicts:
	src/mumble/LookConfig.cpp
	src/mumble/LookConfig.ui
	src/mumble/Settings.cpp