support building cpp bitcode
Merge branch 'release-patched' into utp
Fix to uTP build from Rob Jansen
Add a echo test scenario based on echo example

Extracted from src/configuration/shd-examples.c
Rename source files in echo-libutp, and refer to echo-libutp elsewhere
Add a UTP mode for echo, though for now it just does TCP
Test a client/server too
Refer to libutp