Allow using CairoMakie or GLMakie using the menu()

Author: ufechner7

examples/Project.toml

@@ -1,5 +1,6 @@
 [deps]
 CSV = "336ed68f-0bac-5ca0-87d4-7b16caf5d00b"
+CairoMakie = "13f3f980-e62b-5c42-98c6-ff1f3baf88f0"
 DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
 DelimitedFiles = "8bb1440f-4735-579b-a4ab-409b98df4dab"
 GLMakie = "e9467ef8-e4e7-5192-8a1a-b1aee30e663a"

examples/menu.jl

@@ -2,6 +2,7 @@ using Pkg
 Pkg.activate(@__DIR__)
 
 using GLMakie
+using CairoMakie
 using VortexStepMethod
 using REPL.TerminalMenus
 
@@ -43,6 +44,8 @@ end
 function example_menu()
     options = [
         [("$( splitext(f)[1]) = include(\"$f\")") for f in example_files];
+        "GLMakie.activate!()";
+        "CairoMakie.activate!()";
         "help_me = VortexStepMethod.help(\"$url\")";
         "quit"
     ]