MiniDexed

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Closes #920

• When a MIDI CC 07 message is received on the PCCH (if enabled), it sets the global Master Volume (setMasterVolume), allowing direct control from a MIDI keyboard slider.
• When PCCH is off, normal per-TG volume operation is preserved.
• The change is implemented in mididevice.cpp and includes a log message for traceability.

Code excerpt:

else if (pMessage[1] == MIDI_CC_VOLUME) // CC 07 on PCCH: Master Volume
{
    float fMasterVolume = (float)pMessage[2] / 127.0f;
    m_pSynthesizer->setMasterVolume(fMasterVolume);
    LOGNOTE("MIDI CC07 (Volume) on PCCH: Set Master Volume to %d (%.3f)", pMessage[2], fMasterVolume);
    break; // Do not process further for TGs
}

Testing:

• Send MIDI CC 07 on the PCCH: Master Volume changes.
• Send MIDI CC 07 on other channels: Only TG volume changes.