Move function-scope static QThreadStorage objects to namespace scope

to ensure destruction after all function-scope statics and avoid warning
"thread exited after QThreadStorage destroyed".

src/blackmisc/algorithm.h

@@ -50,6 +50,9 @@ namespace BlackMisc
         //! \threadsafe
         inline std::mt19937 &defaultRandomGenerator()
         {
+            //! \fixme Move rng to namespace scope to ensure destruction after function-local statics
+            //!        and avoid warning "thread exited after QThreadStorage destroyed".
+            //!        This will require careful thought about linkage.
             static QThreadStorage<std::mt19937> rng;
             if (rng.hasLocalData()) { rng.setLocalData(std::mt19937(static_cast<std::mt19937::result_type>(QRandomGenerator::global()->generate()))); }
             return rng.localData();

src/blackmisc/jsonexception.cpp

@@ -17,11 +17,12 @@
 
 namespace BlackMisc
 {
+    static QThreadStorage<std::vector<const CJsonScope *>> g_stack;
+
     //! \private
     auto &jsonStack() noexcept
     {
-        static QThreadStorage<std::vector<const CJsonScope *>> stack;
-        return stack.localData();
+        return g_stack.localData();
     }
 
     // pin vtables to this file

src/blackmisc/logcategorylist.h

@@ -114,7 +114,7 @@ namespace BlackMisc
         static const CLogCategoryList &fromClass()
         {
             static_assert(sizeof(T) > 0, "T must be a complete type, not forward declared");
-            static QThreadStorage<CLogCategoryList> list;
+            static QThreadStorage<CLogCategoryList> list; //! \todo C++17: make list an inline static member variable template
             if (! list.hasLocalData())
             {
                 list.localData().appendCategoriesFromMemberFunction(tag<T>(), THasGetLogCategories<T>());