Z-Stacking features, Video generation features, others

[jmcoreymv]

• Add ability to capture Z-stacks within a protocol, after new protocol creation
• Update post-processing video generation capability to correctly group protocol images and sequence frames. Include timestamp overlay and fps control.
• Fix to allow for grayscale video generation
• Fix for display Z-height objective readout when moving between protocol steps
• Fix for Z-stack acquisition range to include the final step in the range
• Disable overshoot when using mouse scroll to focus
• Remove unused 'system_magnification' parameters from objectives json
• Remove darkfield subtraction when performing a live composite capture
• Refactor objective loading and configuration
• Add new objectives
• Improve error handling when stitching does not find valid image data