Added simple feature UI components and insertion dialog

app/imports/ui/utility/evaluate.js

@@ -0,0 +1,29 @@
+// Computations resolve to numbers
+// vars is a dict of variables to substitute
+function evaluateComputation(string, vars){
+  if (!string) return string;
+  // Replace all the string variables with numbers if possible
+  let substitutedString = string.replace(
+    /\w*[a-z]\w*/gi,
+    sub => vars.hasOwnProperty(sub) ? vars[sub] : sub
+  );
+
+  // Evaluate the expression to a number or return it as is.
+  try {
+    return math.eval(substitutedString);
+  } catch (e){
+    return substitutedString;
+  }
+};
+
+// Strings can have computations in bracers like so: {computation}
+// vars is a dict of variables to substitute
+function evaluateString(string, vars){
+	if (!string) return string;
+  // Compute everything inside bracers
+	return string.replace(/\{([^\{\}]*)\}/g, function(match, p1){
+		return evaluateComputation(p1, vars);
+	});
+}
+
+export { evaluateComputation, evaluateString };