Use apiextension v1

- upgrade from apiextension v1beta1 to v1
 - generate yaml manifest for crd intead of applying it at runtime
  - users will have to apply the manifest with kubectl
 - kg and kgctl log an error if the crd is not present
 - now validation should actually work

Signed-off-by: leonnicolas <leonloechner@gmx.de>

vendor/github.com/gobuffalo/flect/singular_rules.go

@@ -0,0 +1,23 @@
+package flect
+
+var singularRules = []rule{}
+
+// AddSingular adds a rule that will replace the given suffix with the replacement suffix.
+func AddSingular(ext string, repl string) {
+	singularMoot.Lock()
+	defer singularMoot.Unlock()
+	singularRules = append(singularRules, rule{
+		suffix: ext,
+		fn: func(s string) string {
+			s = s[:len(s)-len(ext)]
+			return s + repl
+		},
+	})
+
+	singularRules = append(singularRules, rule{
+		suffix: repl,
+		fn: func(s string) string {
+			return s
+		},
+	})
+}