Pipe symbols in code/emphasis cause reformatting problems

Tables with pipe symbols `|` inside code/emphasis/escaped get formatted incorrectly:

```
a|b
-|-
`|`|foo
\\|bar
```

**Expected** formatting:

```
| a   | b   |
|:----|:----|
| `|` | foo |
| \\  | bar |
```

but get formatted into:

```
| a   | b    |      |
|:----|:-----|:-----|
| `   | `    | foo  |
| \\  | bar  |      |
```
