Use JTable.getRowHeight() instead of font metrics for axis table height.

This approach should, hopefully, be more cross-platform friendly.

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14567 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
MultiShadingPlugin: remember settings somewhat better

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14568 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd