added paused update

Signed-off-by: Matt Bruce <matt.bruce@verizon.com>

VDS/Protocols/Handlerable.swift

@@ -13,6 +13,7 @@ public enum HandlerableUpdateStrategy {
     case immediate
     case delayed
     case alwaysImmediate
+    case paused
 }
 
 public protocol Handlerable: AnyObject, Initable, Disabling, Surfaceable {
@@ -37,6 +38,8 @@ extension Handlerable {
             subject.send()
         case .immediate, .alwaysImmediate:
             updateView()
+        case .paused:
+            break
         }
     }
     
@@ -55,3 +58,15 @@ extension Handlerable where Self: UIControl {
             }).store(in: &subscribers)
     }
 }
+
+extension Handlerable {
+    @discardableResult func pausedUpdate(_ closure: (_ instance: inout Self) -> Void) -> Self {
+        var copy = self
+        let oldStrategy = copy.updateStrategy
+        copy.updateStrategy = .paused
+        closure(&copy)
+        copy.updateStrategy = oldStrategy
+        copy.updateView()
+        return copy
+    }
+}