remove block enum

Replaced with dynamic casts.

app/node/block/clip/clip.cpp

@@ -34,11 +34,6 @@ Node *ClipBlock::copy() const
   return new ClipBlock();
 }
 
-Block::Type ClipBlock::type() const
-{
-  return kClip;
-}
-
 QString ClipBlock::Name() const
 {
   return tr("Clip");

app/node/block/clip/clip.h

@@ -38,8 +38,6 @@ public:
 
   virtual Node* copy() const override;
 
-  virtual Type type() const override;
-
   virtual QString Name() const override;
   virtual QString id() const override;
   virtual QString Description() const override;