Add TCH/H decoder block with AMR multirate support

Add new TCHH channel mode
Add two new optional arguments

    -m CHAN_MODE, --mode=CHAN_MODE
                        Channel mode. Valid options are 'BCCH' (Non-combined
                        C0), 'BCCH_SDCCH4'(Combined C0), 'SDCCH8' (Stand-alone
                        control channel) 'TCHF' (Traffic Channel, Full rate),
                        'TCHH' (Traffic Channel, Half rate)

    --sub-channel=TCH_H_CHANNEL
                        TCH/H sub-channel. [default=0]
    --multi-rate=MULTI_RATE
                        The MultiRrate configuration element from the
                        Assigment Command message. Example: 28111a40. See 3GPP
                        TS 44.018 - 10.5.2.21aa MultiRate configuration

Example:
    grgsm_decode -m TCHH --sub-channel 0 --multi-rate 2811 -o voice.amr ...
diff --git a/swig/grgsm_swig.i b/swig/grgsm_swig.i
index dd86bbc..ec1eea7 100644
--- a/swig/grgsm_swig.i
+++ b/swig/grgsm_swig.i
@@ -38,6 +38,7 @@
 #include "grgsm/receiver/cx_channel_hopper.h"
 #include "grgsm/decoding/control_channels_decoder.h"
 #include "grgsm/decoding/tch_f_decoder.h"
+#include "grgsm/decoding/tch_h_decoder.h"
 #include "grgsm/decryption/decryption.h"
 #include "grgsm/demapping/universal_ctrl_chans_demapper.h"
 #include "grgsm/demapping/tch_f_chans_demapper.h"
@@ -91,6 +92,8 @@
 GR_SWIG_BLOCK_MAGIC2(gsm, control_channels_decoder);
 %include "grgsm/decoding/tch_f_decoder.h"
 GR_SWIG_BLOCK_MAGIC2(gsm, tch_f_decoder);
+%include "grgsm/decoding/tch_h_decoder.h"
+GR_SWIG_BLOCK_MAGIC2(gsm, tch_h_decoder);
 
 %include "grgsm/decryption/decryption.h"
 GR_SWIG_BLOCK_MAGIC2(gsm, decryption);