clean up tcpServ upon error
add Ping method and tests
use byte slices instead of values
replace Code Layout doc with graph
make Ping return an error instead of a bool
Merge pull request #177 from lukechampine/reorg

reorg: scripting + network
make SignInput take an object, not pointer
update client and server for new model
Merge pull request #178 from lukechampine/reorg

Reorg: client + server