issues in camdev branch

[leanfried]

• spindle window sometimes fails to highlight, manual kill necessary
• GUI randomly freezes during prints
• window spontaneously closes: bigger problem on new computer with RAID controller
• delay between reality and preview window for Basler camera only, not webcams
• during pre-print 0 second spindle window trigger, flow sometimes starts and doesn't stop, shouldn't start at all
• fluigent re-connect button doesn't update calibration window
• in camdev: webcams crash window
• in camdev: interacting with GUI causes lost frames in basler camera