CASE v0.31 difficulty and balance update

v0.31 Minor update, balance tweaks and equipment improvements. Overall difficulty reduced. Shop and armory clarity improved.

• Difficulty reduced, quantity of enemy waves reduced to 75%
• Boss health reduced to 75%
• Foxhound, Footpad and Felon cost increased slightly
• Airframe health increased slightly, Warthog increased more
• Fagin can now mount size 3 hardpoints instead of size 2
• Raptor can now mount size 4 hardpoints insrtead of size 3
• Benefit of stealth systems increased by 50%
• Benefits of ECM systems increased by 50%
• Benefits of sensor systems doubled
• AMS tracking improved
• AAMRAM tracking speed increased slightly (still slower tracking than sidewinders)
• All bomb types are slightly more damaging
• Upgraded versions of hardpoints have different detail text to highlight the increased fire rate
• Gun hardpoints (from 20mm cannons to 50mm cannons) fire slightly faster
• Firing cone of guns increased slightly
• Added indicator to stores and armory to highlight when a hardpoint is too large for the currently equipped airframe
• Added indicator to skirmish selection when a skirmish mission is too high-ranked for player