Implement remaining CTLs

[SpaceManiac]

Generic

• [x] OPUS_RESET_STATE
• [x] OPUS_GET_FINAL_RANGE
• [x] OPUS_GET_BANDWIDTH
• [x] OPUS_GET_SAMPLE_RATE
• [ ] OPUS_SET_PHASE_INVERSION_DISABLED (since Opus 1.3)
• [ ] OPUS_GET_PHASE_INVERSION_DISABLED (since Opus 1.3)

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
• [ ] OPUS_SET_DRED_DURATION (since Opus 1.5)
• [ ] OPUS_GET_DRED_DURATION (since Opus 1.5)
• [ ] OPUS_SET_DNN_BLOB (since Opus 1.5)

Decoder

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

[morajabi]

What should I do to make a PR for OPUS_SET_DTX and OPUS_GET_DTX? It seems like it's rather easy. I'm happy to do it.

[SpaceManiac]

Nothing special. Add under // Encoder CTLs an appropriately-named setter and getter of bool and PR it like anything else.

[morajabi]

Done #18

[morajabi]

Done complexity in #21