NetEq: Deprecate playout modes Fax, Off and Streaming

The playout modes other than Normal have not been reachable for a long
time, other than through tests. It is time to deprecate them.

The only meaningful use was that Fax mode was sometimes set from
tests, in order to avoid time-stretching operations (accelerate and
pre-emptive expand) from messing with the test results. With this CL,
a new config is added instead, which lets the user specify exactly
this: don't do time-stretching.

As a result of Fax and Off modes being removed, the following code
clean-up was done:
- Fold DecisionLogicNormal into DecisionLogic.
- Remove AudioRepetition and AlternativePlc operations, since they can
  no longer be reached.

Bug: webrtc:9421
Change-Id: I651458e9c1931a99f3b07e242817d303bac119df
Reviewed-on: https://webrtc-review.googlesource.com/84123
Commit-Queue: Henrik Lundin <henrik.lundin@webrtc.org>
Reviewed-by: Ivo Creusen <ivoc@webrtc.org>
Reviewed-by: Minyue Li <minyue@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23704}

modules/audio_coding/neteq/decision_logic_unittest.cc

@@ -33,19 +33,7 @@ TEST(DecisionLogic, CreateAndDestroy) {
   DelayManager delay_manager(240, &delay_peak_detector, &tick_timer);
   BufferLevelFilter buffer_level_filter;
   DecisionLogic* logic = DecisionLogic::Create(
-      fs_hz, output_size_samples, kPlayoutOn, &decoder_database, packet_buffer,
-      &delay_manager, &buffer_level_filter, &tick_timer);
-  delete logic;
-  logic = DecisionLogic::Create(
-      fs_hz, output_size_samples, kPlayoutStreaming, &decoder_database,
-      packet_buffer, &delay_manager, &buffer_level_filter, &tick_timer);
-  delete logic;
-  logic = DecisionLogic::Create(
-      fs_hz, output_size_samples, kPlayoutFax, &decoder_database, packet_buffer,
-      &delay_manager, &buffer_level_filter, &tick_timer);
-  delete logic;
-  logic = DecisionLogic::Create(
-      fs_hz, output_size_samples, kPlayoutOff, &decoder_database, packet_buffer,
+      fs_hz, output_size_samples, false, &decoder_database, packet_buffer,
       &delay_manager, &buffer_level_filter, &tick_timer);
   delete logic;
 }