Use stack for autocor to avoid large compile times

src/plot.jl

@@ -64,7 +64,7 @@ const supportedplots = push!(collect(keys(translationdict)), :mixeddensity, :cor
         lags = 0:(maxlag === nothing ? round(Int, 10 * log10(length(range(c)))) : maxlag)
         # Chains are already appended in `c` if desired, hence we use `append_chains=false`
         ac = autocor(c; sections = nothing, lags = lags, append_chains=false)
-        ac_mat = cat(reduce.(hcat, Iterators.drop.(ac, 1))...; dims=3)
+        ac_mat = stack(map(stack ∘ Base.Fix2(Iterators.drop, 1), ac))
         val = colordim == :parameter ? ac_mat[:, :, i]' : ac_mat[i, :, :]
         _AutocorPlot(lags, val)
     elseif st ∈ supportedplots