Footprint sideloading tests

test/fixtures/bundle/footprints/injected.js

@@ -0,0 +1,13 @@
+module.exports = {
+  params: {
+      class: 'I'
+  },
+  body: p => `
+    (module injected_test_footprint (layer F.Cu) (tedit 5E1ADAC2)
+    ${p.at /* parametric position */} 
+
+    ${'' /* footprint reference */}        
+    (fp_text reference "${p.ref}" (at 0 0) (layer F.SilkS) ${p.ref_hide} (effects (font (size 1.27 1.27) (thickness 0.15))))
+    )
+  `
+}