Clear sequence buffer on ROI change

Avoid crashing or returning incorrect images that may be leftover in the
sequence buffer.

Increment minor version number (also covering two previous commits that
failed to increment version number).

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14410 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd