[Live mode] Use new TaggedImageStorageLive for live mode.

This saves only one image per channel, and doesn't do the DirectBuffer
conversion that TaggedImageStorageRamFast does. Consequently it avoids a
lot of GC churn that was causing memory issues on 32-bit systems.

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14634 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd