RealFuels v6.2

Changelog:
v6.2 /
*Added new fuels from RedAV8R
*Updated HGR patch from Sandworm
*Tweaked some Firespitter part volumes, added support for more fuselage parts
*swamp_ig:
+Fixed cloning
+Fixed default amounts not loading
+Fixed ProcParts interoperability issues
+Fixed compatibility with Engine Ignitor