Add error case/comments, homogenize copyright headers

api/mockserver.go

api/mockserver_test.go

api/private_test.go

api/register_test.go

bots/bots_test.go

cmd/gen.go

cmd/udb.go

cmd/version.go

crypto/decrypt.go

crypto/encrypt.go

crypto/encryptdecrypt_test.go

globals/log.go

globals/storage_test.go

globals/terminator.go

globals/terminator_test.go

go.mod

go.sum

io/collate.go

main.go

parse/body.go