FR: Improve refresh of external plugin presets
 Originally reported as a bug, but points to design decisions.
I think there’s a problem with detecting new presets for the AUv3 plugin ReSlice by Virsyn.
 Resolved. See below.
Expected behavior (works in other hosts)
- Open the standalone version of ReSlice and save a new preset
- Close the standalone version
- Open the AUv3 version in another host such as AUM
- The new preset is available
In NS2, the preset does not appear after step 3. Other user presets made before installing NS2 do show up.