NiGHTS text improvements

• Increase resolution of capsule destruction time, show time taken to clear a stage/mare
  • To make the latter possible in multi-mare maps, players now have a lastmaretime variable
• Show the mare number in results on multi-mare maps
• Always show the grade for non-special stage NiGHTS maps
  • Grades lower than A were hidden outside of Record Attack, but that only really makes sense for special stages, where getting the emerald is more important than getting a high score
• Tweak some text colors & positioning
• Replace textvar numbers with a more descriptive NTV_ enum
• Fix #1121 (closed) by correcting code that still checked for capsule angle, rather than arg1

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