New build: Create SPIMAcquisition autostart script

Our autostart script ceased working a while ago, with a revamp of the
plugins system in Micro-Manager. The visibility thereof is much more
carefully managed now, so the script takes an alternative approach: It
waits until the MM menu is established, then runs doClick on the
appropriate JMenuItem.

Signed-off-by: Luke Stuyvenberg <stuyvenberg@wisc.edu>