Fixes#6. The module was declared as `module gopacket` in go.mod,
which is not a canonical import path. External projects could not
`go get github.com/mandiant/gopacket` to use any of the 24
protocol packages as a library; the only workaround was to clone
the repo and add a `replace` directive to their own go.mod.
This commit:
- Sets `module github.com/mandiant/gopacket` in go.mod.
- Rewrites 434 import statements across 157 files from the bare
`gopacket/...` prefix to `github.com/mandiant/gopacket/...`.
Pure mechanical change, no behavior difference. Makes the README's
library story (pkg/ directory, 24 reusable packages) actually
usable from external code.
psycep