Prepare the 0.7.1 release

[PetrShtuka]

Prepares the 0.7.1 release and fixes the remaining speaker-routing defects on top of #33.

Fixed

• Speakerphone uses a temporary output override, without defaultToSpeaker, so both the host button and CallKit can return audio to the receiver. A failed speaker change restores the previous preference; an override failure also attempts to restore the category configuration.
• Connecting headphones during a call no longer forces audio back to the speaker. An explicit system route selection updates the saved speaker preference, and recovery is limited to oldDeviceUnavailable — it never overrides an external output.

Changed

• The audio category no longer includes defaultToSpeaker. Hosts use setSpeakerEnabled for the initial speaker route; CallKit controls activation.
• Regression coverage added for CallKit speaker/receiver selections, headset selection and receiver-compatible category configuration.

Release mechanics

Version bumped to 0.7.1 in CallWaveKit.podspec, README.md, CHANGELOG.md, RELEASING.md and Scripts/package-pjsip-release.sh.

Physical-device verification of 0.7.1 is pending — the release ships to enable another on-device QA run, as recorded in FIELD-TESTING.md. Simulator audio tests cannot confirm actual earpiece/speaker playback.

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