[Request] Tooltips for prefabs without worldspawn

[Dragofer]

As of v3.8 and as reported in 5467, DR only supports prefab tooltips for prefabs that contain a worldspawn entity (at least one brush or patch that's left as worldspawn) with an editor_description spawnarg.

This is problematic because most prefabs don't contain such an entity, so if a prefab creator desires to include a tooltip something like a brush cube needs to be added to the prefab (see for instance 6267). This is a little messy as the mapper might not understand its purpose or forget to remove it after placing the prefab.

It's also tricky to create a series of prefabs with descriptions in a single map because there can only be one editor_description spawnarg in the map at a time, so the creator has to store each tooltip in an external file like a Notepad .txt.

I think an ideal solution to this would be that DR prompts for a description when exporting something as a prefab. The prompt window could already be populated if the mapper is overwriting an existing prefab with a description, or if the selection contains a worldspawn entity with an editor_description spawnarg. More flexibility in making tooltips for prefab would imo certainly be a valuable quality of life improvement.