BaumerOptronic: Fix timeout error in acquisition

Time units were incorrect in BOImplementationThread::CurrentImage(). Rename
functions and variables to prevent future errors.

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14288 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
BaumerOptronic: Use correct data type for exposure

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14289 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
BaumerOptronic: Remove gratuitous conversions to short

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14290 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd