[5.x] Add fresh method to Blueprint & Fieldset classes

[duncanmcclean]

This pull request implements a fresh method on the Blueprint and Fieldset classes, making it easier to get the latest instance of a blueprint/fieldset.

I also added a fullyQualifiedHandle method to the Blueprint class as the handle format differs depending on if it's a namespaced blueprint or not and whether it has a namespace set or not. Feel free to rename this method if you can think of a better name 😄

[jasonvarga]

I haven't tested this but I don't think it's quite a great idea to have it. I think that if you use Blueprint::find(), the appropriate events won't get dispatched.

Like EntryBlueprintFound could be used to add fields. It only happens when you do something like $entry->blueprint().

If you did $blueprint->fresh() it would get a fresh blueprint without those fields.

Again, haven't tested so I might be wrong.

[duncanmcclean]

Oh, I hadn't thought of that. Fair enough!