Servo example should use SERVO mode and servoWrite

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
Servo object handling fixes: attachment and writing

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
Debugging for msg_servoWriteMicroseconds action

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
v2.0.8

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>