Adds US Weapons files with fallbacks in order of capability.
Aim-7P added by ED for several US fighters. Falls back to 7MH, and Aim-120B fallback adjusted from MH to P.
Aim-9J and Aim-9Juli added by ED for the Mirage F-1, also used by F-4 mod and will likely be added to the F-4E whenever it ships. Aim-9J placed between 9P and 9B, Aim-9 Juli placed between 9L and 9P5.
2x9j and 2x9Juli added by VSN for F-4 mod. Placed between 2x versions of same missiles as above.
Aim-7E now falls back to 2xAim9x instead of single Aim9x so that it runs through the entire loop of Aim-9s.