Issue

I think that the current functionality of this package seems too similar to that of FlightSims.jl.

Suggestion

IMO, it's possible that this package exports only the core functionality of some FlightGNC stuffs (that you intended, perhaps guidance laws?) construct some off-the-shelf FlightSIms.jl-like Envs and Controllers using the core functionality of FlightGNC.jl in a new package, namely, FSImEnvs.jl.

For example, suppose that the following stuffs are ready-to-export in this package as

function dynamics_missile(p, v, u)
    # p_dot = ...
    p_dot, v_dot
end

function command_BPNG(p_M, v_M, something-like-them)
    # some appropriate outputs
end

and in FSimEnvs.jl, we may construct a FSim-like envs and controllers as the following.

struct MissileEnv <: AbstractEnv  # FSimBase-dependent
    # some-parameters-we-need
end
function Dynamics!(env::MissileEnv)
    @Loggable function dynamics!(dx, x, params, t; u)
        @unpack p, v = dx
        p_dot, v_dot = FlightGNC.dynamics_missile(p, v, u)
        dx.p = p_dot
        dx.v = v_dot
    end
end

abstract type MissileGuidance <: AbstractController  # FSimBase-dependent
struct  BPNG <: MissileGuidance
    # blahblah...
end
function Command(BPNG)  # FSimBase-dependent
    # blahblah...
end

Then, import FSimEnvs.jl in FlightSims.jl!

Notes

Why is it necessary?

• This package can be a package independent of FlightSims.jl. It makes this package reusable regardless of users' simulator preference.
• Also, there may be no big difference between FlightSims.jl and this package, which would be exhausting.

One more thing...

• Of course, it's a suggestion. The code structure and road map of this package depend on you :)

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Files whose names are .DS_Store seems to be included in every directory.