search: Wave format option

When downloading audio search results, we currently just have a choice of MTS or PCM.

Since PCM is not playable as is, having a Wave format (audio.wav) option would be handy for users. This is just a matter of prepending the Wave header to the PCM data.

type WaveHeader struct {
    ChunkID      [4]byte // "RIFF".
    ChunkSize    uint32  // Size of the entire file, minus eight bytes.
    Format       [4]byte // "WAVE".
    Subchunk1ID   [4]byte // "fmt ".
    Subchunk1Size uint32
    AudioFormat   uint16 // 1 for PCM audio.
    NumChannels   uint16 // 1 for mono audio, 2 for stereo audio.
    SampleRate    uint32 // The sample rate in Hz.
    ByteRate      uint32 // The byte rate in bytes per second.
    BlockAlign    uint16 // The number of bytes in one block of audio data.
    BitsPerSample uint16 // The number of bits per sample of audio data.
    Subchunk2ID   [4]byte // "data"
    Subchunk2Size uint32
}

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