Bug fixes Part 2

- If the internal v4l2 grabber is switched off, it will now be de-initialized (Issue: #542)
- Extended error detection in MJPEG decompress method
- Default instance capture activation if it is missing in the configuration (https://hyperion-project.org/goto/post?id=13656#post-13656)
- Fixed some small (think)mistakes (https://hyperion-project.org/threads/hdmi-grabber.3302/page-2#post-14887)

libsrc/hyperion/CaptureCont.cpp

@@ -82,6 +82,7 @@ void CaptureCont::setSystemCaptureEnable(const bool& enable)
 		}
 		_systemCaptEnabled = enable;
 		_hyperion->getComponentRegister().componentStateChanged(hyperion::COMP_GRABBER, enable);
+		_hyperion->setComponentState(hyperion::COMP_GRABBER, enable);
 	}
 }
 
@@ -103,6 +104,7 @@ void CaptureCont::setV4LCaptureEnable(const bool& enable)
 		}
 		_v4lCaptEnabled = enable;
 		_hyperion->getComponentRegister().componentStateChanged(hyperion::COMP_V4L, enable);
+		_hyperion->setComponentState(hyperion::COMP_V4L, enable);
 	}
 }