sbc: store 0x0000 as frame header
sbc encoder: use pcm stream
ectracting sbc encoder
sbc plc: add support in bludroiod decoder impl
sbc decoder: integration with sco_util
fix warnings related to potential loss of precision for integer conversions
add msbc supprot
mbedtls: add naive double and add method for ec to safe RAM - used when MBEDTLS_ECP_WINDOW_SIZE == 1
remove printf, update sbc test Makefile
Merge branch 'develop' into a2dp
mSBC: extend SBC library for mSBC
sm: add cpp guart around function definition for custom allocator
sbc: add encoder/decoder from bludroid project, apache license
sm: use correct ec test key, reduce memory to 1500 bytes
sm: use custom memory allocator for mbedtls if not HAVE_MALLOC
sm: use mbedtls's memory allocator with 5k buffer if HAVE_MALLOC is not defined
sm: track calloc/free in mbedtls
test/sm: add missing mbedtls files
test/sm: generate ec keypair. remove files not needed for software ec calculation
mbedtls: disable unused elliptic curves
sm: add ecliptic curve support from mbedtls
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