Fixes #62630

es6 aftermath, static property of type X are created before decorating type X and therefore failing the instanceof-check

Fixes #55718

Fixes #56097

When a symbolic column is used while creating a webview panel, instead set the `viewColum` as `undefined` and then resolve it once we know the real (non-symbolic) column

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

This reverts commit 383d1417.