Use a new method to set progress - setting in the interview order block breaks stuff

Do it in a different way. Maybe:

Create a DADict, like this:

```
---
# interview order
question: |
  ...
  set_progress_to[40] # Will run the set_progress_to block one time, for each unique index value. it won't reset it to that value
---
objects:
  set_progress_to: DADict
---
code: |
  set_progress(float(i))
  set_progress_to[i] = True
```