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Standardise use of OffsetVectors #81

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This PR modifies all GeneralisedFilters/SSMProblems code to use use an OffsetArray for storing the xs and zs. Docstrings are updated to match.

This cleans up a few bits of the codebase and solves #49.

prev_x = t == 1 ? x0 : xs[t - 1]
prev_z = t == 1 ? z0 : zs[t - 1]
xs[t] = simulate(rng, model.outer_dyn, t, prev_x; kwargs...)
xs[t] = simulate(rng, model.outer_dyn, t, xs[t - 1]; kwargs...)
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Might be missing something, but why not something like this:

    xs = Vector{T_dyn}(undef, T)
    ys = Vector{T_obs}(undef, T)

    xs[1] = simulate(rng, model.dyn; kwargs...)
    for t in 1:T
        ys[t] = simulate(rng, model.obs, t, xs[t]; kwargs...)
        if t < T
            xs[t+1] = simulate(rng, model.dyn, t, xs[t]; kwargs...)
        end
    end

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