DemoCamera: Fix VC++ warnings

Signed/unsigned mismatch, implicit conversions.

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14386 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
Utilities: Fix VC++ warnings

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14387 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
VariLC: Fix VC++ warning

Signed/unsigned mismatch.

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14388 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
pgFocus: Fix VC++ warning

Signed/unsigned mismatch.

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14389 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14390 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd