Lay out device/stack interfaces - Netdev/Netlink (#92)

* good code today

* add netdev.Runner

* round off APIs more

* better interface method documentation

* improve DHCP netstack API

* add pico w netdev example

* remove temp file

* keep thinking about this. this is hard :/

* fix ci

* small fixer

* working dhcp

* fix rebase API mismatches

* begin adding espradio example

* keep working on espradio, icmp not working

* fix icmp by fixing dhcp

.gitignore

@@ -9,6 +9,8 @@ profiles/
 # Dependency directories after running `go mod vendor`
 vendor/
 
+# Wifi credentials
+*.credentials
 
 # Binaries for programs and plugins
 *.elf