Significantly improved logging precision, added hole filling for missing data points (user-preferences for this still pending)

Improved line chart, brought back movement on HUD (but still looks somewhat wrong on the dials). Fixed logging for ground time mode

Fixed SLUGS related warnings. Commented the visibilityChanged connection (MainWindow.cc 535) because it does not take into account when the widget is hidden when changing perspective. Will work on a fix

Significantly improved plotting, now capturing data in linechart allows limmediate processing / analysis of the whole flight