move two gsm0480_send_*() to xsc as gsm0480_gen_*()

Have two separate gsm0480_send_ussdNotify() and gsm0480_send_releaseComplete()
for each of libbsc and libmsc. Move their core into libxsc as generator
functions returning a msgb.

Add src/libbsc/gsm_04_80_utils.c (note, not 04_08) to implement the libbsc
side of it.

The code is identical, but the linked structs and functions differ in each
case. There could be a common source file built for both, but I decided against
it, for more clarity I hope.

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