Initial implementation

This implements the device for monitoring SPI experiment. The initial implementation includes:

1. SPI gui

• hit image
• hit-rate plot
• hitscore plot
• hitscore histogram
• hit mask bar plot

2. Powder sum gui

• hits average image
• misses average image (background)

Dependencies:

• LitPixelCounter addon{width=500px}
• Scene helpers karaboDevices/sceneUtils>
• calng utils calibration/calngutils>

KaraboGui needs karaboDevices/guiextensions> >= 0.11.3

Screenshots:

SPI gui

Powder sum gui

@hammerd @turkot