Make CRTP base classes ctors protected

This forbids to create base class instances which direct usage could lead to UB.

Chaos/Hash/Hash.hpp

@@ -20,6 +20,9 @@ public:
         return Impl().ToHexString();
     }
 
+protected:
+    Hash() = default;
+
 private:
     const T & Impl() const
     {

Chaos/Hash/Hasher.hpp

@@ -24,6 +24,9 @@ public:
         return Impl().Finish();
     }
 
+protected:
+    Hasher() = default;
+
 private:
     const T & Impl() const
     {