v4.5.1

• Stack folder tiles no longer show a white corner when the cover drop shadow is off (#362)
• Toggling rotation from a start menu action redraws the shelf straight away, instead of on the next tap
• With a custom chip colour, the currently-reading chip keeps its outline and the divider beside it stays visible
• Calibre custom columns are now read from metadata files up to 64 MB (#357)
• Calibre number columns above a million show in full, rather than as 1.2e+06
• Some English/American spelling inconsistency caught and corrected (#358)