Fix Capture aborting exposure of Focus
This MR attempts to fix two situations where Capture aborts the running exposures of Focus:
- When Capture is asked to capture an image through
captureImage
while Focus is busy. - When Capture receives a guiding failure (not a deviation) from Guide while Focus is busy.
This MR also avoids changing Capture states when asked to capture one frame or start framing while Focus is busy.