Quick quickfix fixes (#130)

* Update quickfix for Monaco >= 0.34.0

Quickfix was not doing anything in a production build, and failing
with "unsupported edit" in a debug build.

The problem was the `edit` attribute was renamed to `textEdit` in
Monaco 0.34.0.

* Fix quickfixes for invalid operators

We need to look up the replacement operator in this case rather than
just trying to upper case it (which does nothing for these operators).

src/bbcbasic.js

@@ -247,17 +247,20 @@ export function registerBbcBasicLanguage() {
         provideCodeActions(model, range, context) {
             const actions = context.markers.map(marker => {
                 const text = model.getValueInRange(marker);
+                const replacement = InvalidOperatorMap.has(text) ?
+                    InvalidOperatorMap.get(text) :
+                    text.toUpperCase();
                 return {
-                    title: `Replace with ${text.toUpperCase()}`,
+                    title: `Replace with ${replacement}`,
                     diagnostics: [marker],
                     kind: "quickfix",
                     edit: {
                         edits: [
                             {
                                 resource: model.uri,
-                                edit: {
+                                textEdit: {
                                     range: marker,
-                                    text: text.toUpperCase(),
+                                    text: replacement,
                                 },
                             },
                         ],