Add camera usage description and Encryption Exception for iOS

[ann0see]

QTMultimedia seems to require camera access permissions even though we do not request this. As it's in the code, AppStore connect requests a description. It is safe to NOT allow access.

Some time ago, I tracked it down to QTMultimedia: https://doc.qt.io/qt-6.5/qtmultimedia-apple.html

Short description of changes

CHANGELOG: SKIP

Context: Fixes an issue?

Related to: #3406 (loosely)
Does this change need documentation? What needs to be documented and how?

Status of this Pull Request

Ready for review
What is missing until this pull request can be merged?
Link source

Checklist

• I've verified that this Pull Request follows the general code principles
• I tested my code and it does what I want
• My code follows the style guide
• I waited some time after this Pull Request was opened and all GitHub checks completed without errors.
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[ann0see]

Added encryption exemption flag too. This should make submitting to App Store Connect easier.

[pljones]

Can we document somewhere what you wrote above? It's not always easy to find explanations in pull requests. I hesitate to say it should be in the code... Maybe Jamulus.pro for iOS could mention it? Somewhere the dependency gets pulled in, really.

[ann0see]

deploy_ios.sh ?

QT multimedia gives a huge headache for iOS from my gut feeling.

1. Switching to FFMPEG breaks the app Add workaround from QTBUG-129651 for iOS FFMPEG linking #3581
2. It requests camera access for no reason
3. It introduces a dependency which can change at any time
   I'd be inclined to ifdef it out on iOS (but this breaks the broken accessibility on iOS even more)