Attention is currently required from: fixeria, pespin.

fixeria uploaded patch set #4 to this change.

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proxy: implement RF path simulation

Compute real ToA/RSSI/CI values for forwarded bursts instead of the
fixed placeholder constants in burst_fwd.c.  Each channel gets its own
struct path_sim_state, tracking Tx power/attenuation, Timing Advance,
reported ToA/RSSI/CI, and burst-dropping parameters.  RSSI defaults to
a path-loss formula (Tx power - burst attenuation - fixed path loss)
unless overridden via FAKE_RSSI.

Add the CTRL commands needed to drive this: SETTA, SETPOWER,
NOMTXPOWER, RFMUTE, and the FAKE_TOA/FAKE_RSSI/FAKE_CI/FAKE_DROP
simulation helpers.  RFMUTE and burst dropping (FAKE_DROP) turn a
forwarded burst into a NOPE.ind, matching the existing NOPE.req
handling path.

Change-Id: Iefa51d6b0e0bba1f12bdbcdf576528e7d3588b8f
Related: OS#6672
---
M proxy/Makefile.am
A proxy/include/osmocom/proxy/path_sim.h
M proxy/include/osmocom/proxy/trx.h
M proxy/src/Makefile.am
M proxy/src/burst_fwd.c
M proxy/src/ctrl_cmd.c
A proxy/src/path_sim.c
M proxy/src/trx.c
8 files changed, 367 insertions(+), 13 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-trx refs/changes/06/43606/4

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