Performance Fixes

[alphadelta332]

• Reduced low altitude descent speeds across the board (some Props were sitting at 180-200kts below A030, 160kts is more appropriate)
• Split Later model 737 (Max, Next Gen) data in to its own category, to enable more appropriate cruise speeds (M078 instead of M075)
• Added B37M, B39M, B3XM performance data
• Split A320 Family in to its own category, to enable different performance to 757/767.
• Moved A318 performance to be with A320 family
• Moved F70 Performance in to F100 category
• Removed Performance Data entry with no aircraft in it

All changes to aircraft performance sourced from EuroControl