DemoCamera: Honor FastImage setting for snap, too

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@13890 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
Add ability to make adding images to acquisitions be asynchronous.

Call gui.setAcquisitionAddImageAsynchronous(acquisition name) and all future
calls to e.g. addImageToAcquisition() should return much faster.

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@13891 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
Minor fix to r13891 (avoid sending POISON twice)

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@13892 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
Add ipch/ to .gitignore

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@13893 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
Fix warnings in MMCore

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@13894 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@13895 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd