add missing destructors

Found with MSVC warnings C4626,C5027

Signed-off-by: Rosen Penev <rosenp@gmail.com>

ebml/EbmlElement.h

@@ -278,6 +278,10 @@ class EBML_DLL_API EbmlDocVersion {
       , maxver(max)
     {}
 
+    ~EbmlDocVersion() = default;
+    EbmlDocVersion(const EbmlDocVersion&) = delete;
+    EbmlDocVersion& operator=(const EbmlDocVersion&) = delete;
+
     // the element with this EbmlDocVersion should never be used if this methods return true
     bool IsAlwaysDeprecated() const {
       return minver == ANY_VERSION;
@@ -331,6 +335,10 @@ class EBML_DLL_API EbmlCallbacks {
       assert(Creator!=nullptr);
     }
 
+    ~EbmlCallbacks() = default;
+    EbmlCallbacks(const EbmlCallbacks&) = default;
+    EbmlCallbacks& operator=(const EbmlCallbacks&) = delete;
+
         inline const EbmlId & ClassId() const { return GlobalId; }
         inline constexpr const EbmlSemanticContext & GetContext() const { return Context; }
         inline const char * GetName() const { return DebugName; }
@@ -359,6 +367,10 @@ class EBML_DLL_API EbmlCallbacksDefault : public EbmlCallbacks {
       :EbmlCallbacks(Creator, aGlobalId, false, hasDefault, aDebugName, aContext, aVersion)
     {
     }
+
+    ~EbmlCallbacksDefault() = default;
+    EbmlCallbacksDefault(const EbmlCallbacksDefault&) = default;
+    EbmlCallbacksDefault& operator=(const EbmlCallbacksDefault&) = delete;
 };
 
 template<typename T>
@@ -392,6 +404,10 @@ class EBML_DLL_API EbmlSemantic {
         inline explicit operator const EbmlCallbacks &() const { return Callbacks; }
         inline EbmlCallbacks const &GetCallbacks() const { return Callbacks; }
 
+    ~EbmlSemantic() = default;
+    EbmlSemantic(const EbmlSemantic&) = default;
+    EbmlSemantic& operator=(const EbmlSemantic&) = delete;
+
     private:
     const bool Mandatory; ///< whether the element is mandatory in the context or not
     const bool Unique;
@@ -414,6 +430,10 @@ class EBML_DLL_API EbmlSemanticContext {
       : GetGlobalContext(aGetGlobalContext), MyTable(aMyTable), Size(aSize),
         UpTable(aUpTable), MasterElt(aMasterElt) {}
 
+    ~EbmlSemanticContext() = default;
+    EbmlSemanticContext(const EbmlSemanticContext&) = delete;
+    EbmlSemanticContext& operator=(const EbmlSemanticContext&) = delete;
+
     bool operator!=(const EbmlSemanticContext & aElt) const {
       return ((Size != aElt.Size) || (MyTable != aElt.MyTable) ||
         (UpTable != aElt.UpTable) || (GetGlobalContext != aElt.GetGlobalContext) ||
@@ -617,6 +637,10 @@ class EBML_DLL_API EbmlElementDefault : public EbmlElement {
       :EbmlElement(classInfo, aDefaultSize, false)
     {}
 
+    ~EbmlElementDefault() override = default;
+    EbmlElementDefault(const EbmlElementDefault&) = default;
+    EbmlElementDefault& operator=(const EbmlElementDefault&) = delete;
+
     bool IsDefaultValue() const final {
       if (!ElementSpec().HasDefault())
         return false;
@@ -637,6 +661,9 @@ class EBML_DLL_API EbmlElementDefaultSameStorage : public EbmlElementDefault<T>
     using EbmlElementDefault<T>::EbmlElementDefault;
     using EbmlElementDefault<T>::operator const EbmlId &;
 
+    EbmlElementDefaultSameStorage(const EbmlElementDefaultSameStorage&) = default;
+    EbmlElementDefaultSameStorage& operator=(const EbmlElementDefaultSameStorage&) = delete;
+
     EbmlElementDefaultSameStorage<T> & SetValue(const T & NewValue) override
     {
       Value = NewValue;
@@ -675,6 +702,9 @@ class EBML_DLL_API EbmlElementDefaultStorage : public EbmlElementDefault<T> {
     using EbmlElementDefault<T>::EbmlElementDefault;
     using EbmlElementDefault<T>::operator const EbmlId &;
 
+    EbmlElementDefaultStorage(const EbmlElementDefaultStorage&) = default;
+    EbmlElementDefaultStorage& operator=(const EbmlElementDefaultStorage&) = delete;
+
     EbmlElementDefaultStorage<T,S> & SetValue(const T & NewValue) override
     {
       Value = static_cast<S>(NewValue);