* Prepare support for sqlx
Just setting up some basic skeleton to start
replacing gorp queries with sqlx.
There is still an issue with efficiently writing
cross-platform named queries, because :FieldName
needs to be :fieldname for Postgres.
The positional params can be rebound depending on
driver name. But named queries can't from my
investigation. Will look into this.
```release-note
NONE
```
* Refactor mapper
```release-note
NONE
```
* Forgot to init slice
```release-note
NONE
```
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
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