Replace some common index based for loops with for-of loops

Replaces many loops of the form:

```js
for (let i = 0; i < elements.length; ++i) {
    const i = elements[i];
   ...
}
```

with:

```js
for (const element of elements) {
    ...
}
```

Mix of a horrible regex based find/replace and manual touch ups

extensions/html-language-features/server/src/modes/pathCompletion.ts

@@ -139,9 +139,9 @@ function pathToSuggestion(p: string, valueBeforeCursor: string, fullValue: strin
 }
 
 function resolveWorkspaceRoot(activeDoc: TextDocument, workspaceFolders: WorkspaceFolder[]): string | undefined {
-	for (let i = 0; i < workspaceFolders.length; i++) {
-		if (startsWith(activeDoc.uri, workspaceFolders[i].uri)) {
-			return path.resolve(URI.parse(workspaceFolders[i].uri).fsPath);
+	for (const folder of workspaceFolders) {
+		if (startsWith(activeDoc.uri, folder.uri)) {
+			return path.resolve(URI.parse(folder.uri).fsPath);
 		}
 	}
 	return undefined;