patterns with double quotes and backticks

+ improved highlighting
+ many shapeshifter fixes
+ add highlighting to minirepl
+ add error handling to minirepl

strudel.mjs

@@ -620,6 +620,9 @@ class Pattern {
     edit(...funcs) {
       return stack(...funcs.map(func => func(this)));
     }
+    pipe(func) {
+      return func(this);
+    }
 
     _bypass(on) {
       on = Boolean(parseInt(on));