Analysis:
This bug is there for following reasons.
1.ElectrodeButton for channels is directly added to the ChannelMappingEditor component.
2.When we drag the button we set the visibility of the lastHoverButton which makes it visible and shows on top of other components.
3. Also finding the correct button Logic is not proper as we are not considering the buttons which are scrolled up and invisible.

Solution:
1. Create Viewport for holding the ElectrodeButton for channels.
2. Also create a Holder Component to hold all ElectrodeButton.
3. Add the ElectrodeButton to Holder Component and set the size of the Holder Component to fit all buttons.
4. Set setViewPosition for Viewport based on the scroll and drag.

More Improvement:
1. We can remove upButton and downButton.
2. Viewport has its own scrolling which can be used for scrolling. Currently its been hidden using code "electrodeButtonViewport->setScrollBarsShown(false,false,true,true);"

Update setup.sh to use new Makefile

Fix eventData size limit of 255 bytes

* Overflow could be easily triggered by sending a long message
via the message center

Strip NULL when writing messages to file

* For original and binary recording engines
* This allows the messages file to be viewed in a text editor

Pulsepal setinterpulse fix

splitter constructor doesn't set processor type, with fun consequences

put MAC_PACKAGE_DIR/include on header search path for all plugins

add pre-build action to create Env.xcconfig if it doesn't exist

Fix audiomonitor offset

Xcode projects for OpenEphysHDF5Lib and NWBFormat

Added Xcode project for OpenEphysHDF5Lib, which builds a shared library (libOpenEphysHDF5.dylib) and installs it in open-ephys.app/Contents/Frameworks.  On macOS, the KWIKFormat plugin now links against libOpenEphysHDF5.dylib.

Added Xcode config files for building dylib's that are embedded in open-ephys.app/Contents/Frameworks