problem with ref & sql generation

Hi team, I found some issues:

## 1. sql generation:
the following markup
```dbml
ref: remfo.cards.user_id - auth.users.id
```
generates following sql:
```sql
ALTER TABLE "auth"."users" ADD FOREIGN KEY ("id") REFERENCES "remfo"."cards" ("user_id");
```
This is confusing.
I feel the table we are altering should come first as it will resemble the sql query more.

## 2. dbdiagram should show an arrow
for syntax:
```dbml
ref: remfo.cards.user_id - auth.users.id
```

I find following more informative:

than:

(look at the arrow)