Temp graph, slicer time estimates

Additions

• Touch calibration is done now in lvgl, making it look more consistent with the rest of the UI
• Make stats panel accessible from move panel
• Improve Z offset menu (automatically moves printer, Set Z, Clear Z offset) (#46)
• Slight optimalisations to improve the user experience:tm:
• Add graph to temp panel
• Add slicer time based estimates (#13)
• Add API Key flow (#48)

Fixes

• Fix klipper connect screen not displaying try count when moonraker power devices are available (#45)
• When klipper isn't available on the klipper connect screen, don't hang the UI for a long time (#45)
• Clear moonraker power devices when losing connection to klipper
• Fix possible nullref in data fetch loop (#49)