Given IP-aware ConnKeys, ConnTuples aren't really required any more. ConnTuple
had two benefits:
- It preserved the original src/dst orientation from the packet headers it was
based on, which IPBasedConnKey now tracks and provides accessor methods for.
- In IPBasedAnalyzer::AnalyzePacket() its instance survived past the std:move()
of the key into NewConn(), which we sidestep by keeping the original src address
and port around until we need after the connection is obtained.
This largely copies over Spicy's `.clang-format` configuration file. The
one place where we deviate is header include order since Zeek depends on
headers being included in a certain order.
This also also combines the old TransportLayerAnalyzer class into
SessionAdapter, and removes the old class. This requires naming changes
in a few places but no functionality changes.
