UserDefinedSerial: Rename properties for consistency

SetState-command -> SetPosition-command
SetState-response-* -> SetPosition-response-*

to be consistent with QueryPosition-command, etc.

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14163 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
UserDefinedSerial: Fix octal escape sequences

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14164 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
Make dialog appear in center of window rather than screen to be nicer when using multiple monitors

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14165 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd