Add reserve fuel tank capacities to ships

These contribute towards ship mass, and are necessary for accurate jump
range calculation.

Ref: https://forums.frontier.co.uk/threads/reserve-tank-sizes-for-all-ships.460434/

ships/federal_corvette.json

@@ -21,7 +21,8 @@
       "pitch": 28,
       "roll": 75,
       "yaw": 8,
-      "crew": 3
+      "crew": 3,
+      "reserveFuelCapacity": 1.13
     },
     "retailCost": 187969450,
     "requirements": {