Reload scrapers button (#592)

* Add reload scraper option to performer details
* Add scraper reload to scene edit page
* Show scene scraper menu when no queryable scrapers
* Add 0.3 changelog

pkg/api/resolver_mutation_scraper.go

@@ -0,0 +1,17 @@
+package api
+
+import (
+	"context"
+
+	"github.com/stashapp/stash/pkg/scraper"
+)
+
+func (r *mutationResolver) ReloadScrapers(ctx context.Context) (bool, error) {
+	err := scraper.ReloadScrapers()
+
+	if err != nil {
+		return false, err
+	}
+
+	return true, nil
+}