Add client microphone streaming support

[logabell]

Add client microphone streaming support

What This Does

This ports client-to-host microphone passthrough support into moonlight-tv so the client can capture local microphone input, encode it as timed Opus voice packets, and send it to the host when microphone streaming is negotiated.

Specifically, this PR:

• adds persisted microphone settings and input-device selection in the audio settings pane
• adds an SDL microphone capture path with Opus encoding and timed packet delivery during active stream sessions
• wires microphone negotiation and encryption flags into the stream configuration
• updates core/moonlight-common-c to the microphone-capable revision required for this feature

Intended Usage

This is intended to be used with my Apollo fork and the related Apollo upstream work:

• Apollo fork: logabell/Apollo
• Apollo upstream PR: ClassicOldSong/Apollo#1428
• Moonlight reference fork: logabell/moonlight-qt-mic

This moonlight-tv PR is meant to complement that Apollo work so microphone passthrough can be used end-to-end with the Apollo fork.

Context

This PR was submitted at the request of community member LightningJC.

Notes

• The submodule URL changes because upstream moonlight-common-c does not yet contain the microphone APIs used here.

Verification

• git diff --check
• attempted cmake -S . -B build on Windows, but configuration stops immediately because pkg-config is not installed in this environment