Refactor model into an interface and remove any ABC Model specific code from src/code_gen/. Also generate functions instead of direct code evaluation in execute()

examples/plot_chain.jl

@@ -12,7 +12,7 @@ function gen_plot(filepath)
         return
     end
 
-    g = parse_abc(filepath)
+    g = parse_dag(filepath, ABCModel())
 
     Random.seed!(1)
 
@@ -48,23 +48,10 @@ function gen_plot(filepath)
 
     println("\rDone.")
 
-    plot(
-        [x[1], x[2]],
-        [y[1], y[2]],
-        linestyle = :solid,
-        linewidth = 1,
-        color = :red,
-        legend = false,
-    )
+    plot([x[1], x[2]], [y[1], y[2]], linestyle = :solid, linewidth = 1, color = :red, legend = false)
     # Create lines connecting the reference point to each data point
     for i in 3:length(x)
-        plot!(
-            [x[i - 1], x[i]],
-            [y[i - 1], y[i]],
-            linestyle = :solid,
-            linewidth = 1,
-            color = :red,
-        )
+        plot!([x[i - 1], x[i]], [y[i - 1], y[i]], linestyle = :solid, linewidth = 1, color = :red)
     end
 
     return gui()