Make policy template allow logical id of resources

When adding policy templates to functions one has to refer to the cloudformation documentation to find the correct intrinsic function to fetch the reference desired by the policy.

For example:
DynamoDBCrudPolicy requires a TableName that's exposed through `Ref`:
```
{
"DynamoDBCrudPolicy": {
"TableName": {
"Ref": "MyTable"
}
}
}
```

...but SNSPublishMessagePolicy expects a TopicName that's exposed via `GetAtt`:
```
{
"SNSPublishMessagePolicy": {
"TopicName": {
"Fn::GetAtt": [
"MyTopic",
"TopicName"
]
}
}
}
```

Would it be possible to somehow just provide the logical ID to the resource and let the policy template processor inject the correct intrinsic function for the resource?

Like this:
```
{
"DynamoDBCrudPolicy": {
"TableName": "MyTable"
}
}
```
...or maybe:
```
{
"DynamoDBCrudPolicy": {
"TableLogicalId": "MyTable"
}
}
```

[Here's a video ](https://www.dropbox.com/s/1dmk51tru6b6t6q/policy-template.mp4?dl=0) of what I'm trying to achieve. At the moment I'm defaulting the intrinsic function to `Ref`.