Factored out reset/1200bps-touch subroutines and executils

Reusing the implementation available in arduino-cli

Author: cmaglie

go.mod

@@ -5,4 +5,8 @@ go 1.14
 // branch with support for serial timeouts
 replace go.bug.st/serial => github.com/cmaglie/go-serial v0.0.0-20200923162623-b214c147e37e
 
-require go.bug.st/serial v1.1.1
+require (
+	github.com/arduino/arduino-cli v0.0.0-20200924151007-69ac12c98b2b
+	github.com/pkg/errors v0.9.1
+	go.bug.st/serial v1.1.1
+)