Added tests for custom lossy and lossless packets.

Fixed bug with lossless packets.
spelling corrections
Merge branch 'cgar-spelling'
Grammar fix
Fix exceptional leak in msi.c
Remove unused variable in handle_sendnodes
Remove unused function in DHT.c
Merge branch 'tux3-master'
Merge branch 'master' of https://github.com/urras/toxcore
Merge branch 'smallfix' of https://github.com/tux3/toxcore
Merge branch 'compiletimeLTO' of https://github.com/tux3/toxcore