Implement remaining CTLs

[SpaceManiac]

Generic

• [x] OPUS_RESET_STATE
• [x] OPUS_GET_FINAL_RANGE
• [x] OPUS_GET_BANDWIDTH
• [x] OPUS_GET_SAMPLE_RATE

Encoder

• [x] OPUS_SET_COMPLEXITY
• [x] OPUS_GET_COMPLEXITY
• [x] OPUS_SET_BITRATE
• [x] OPUS_GET_BITRATE
• [x] OPUS_SET_VBR
• [x] OPUS_GET_VBR
• [x] OPUS_SET_VBR_CONSTRAINT
• [x] OPUS_GET_VBR_CONSTRAINT
• [ ] OPUS_SET_FORCE_CHANNELS
• [ ] OPUS_GET_FORCE_CHANNELS
• [ ] OPUS_SET_MAX_BANDWIDTH
• [ ] OPUS_GET_MAX_BANDWIDTH
• [ ] OPUS_SET_BANDWIDTH
• [ ] OPUS_SET_SIGNAL
• [ ] OPUS_GET_SIGNAL
• [ ] OPUS_SET_APPLICATION
• [ ] OPUS_GET_APPLICATION
• [x] OPUS_GET_LOOKAHEAD
• [x] OPUS_SET_INBAND_FEC
• [x] OPUS_GET_INBAND_FEC
• [x] OPUS_SET_PACKET_LOSS_PERC
• [x] OPUS_GET_PACKET_LOSS_PERC
• [x] OPUS_SET_DTX
• [x] OPUS_GET_DTX
• [ ] OPUS_SET_LSB_DEPTH
• [ ] OPUS_GET_LSB_DEPTH
• [ ] OPUS_SET_EXPERT_FRAME_DURATION
• [ ] OPUS_GET_EXPERT_FRAME_DURATION
• [ ] OPUS_SET_PREDICTION_DISABLED
• [ ] OPUS_GET_PREDICTION_DISABLED

Decoder

• [x] OPUS_SET_GAIN
• [x] OPUS_GET_GAIN
• [x] OPUS_GET_LAST_PACKET_DURATION
• [x] OPUS_GET_PITCH