Add update script to update all subprojects

.gitignore

@@ -4,3 +4,5 @@ exports
 *.mem
 
 LocalPreferences.toml
+
+start.jl

update.jl

@@ -0,0 +1,22 @@
+using Pkg: Pkg
+
+function update()
+    projects = (
+        ".",
+        "test",
+        "analysis",
+        "graphics/CairoMakie_graphics",
+        "graphics/Luxor_graphics",
+        "performance",
+        "visualization",
+    )
+
+    for project in projects
+        Pkg.activate(project)
+        Pkg.update()
+    end
+
+    return nothing
+end
+
+update()