Clang/Clazy pass over AzCore (#5045)

* Multiple cleanups ( tidy etc. )

Coalesce nested namespaces.

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Multiple cleanups ( tidy etc. ) cntd.

Converted Uuid into POD ( defaulted the constructor )
Add `&/const &` to `for` loops that benefit from their use
Some Qt optimizations ( string ref, prevent container detaches, etc. )
Replace `::bind` in a few places.
Replaced the use of AZ_CRC with AZ_CRC_CE in a few places.
Replace a few `typedef`s with `using`s

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Linux compilation fix.

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Apply review suggestions.

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Fix vs2019 build

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Small clang re-format in StringFunc.cpp

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Apply reviewer's suggestions.

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

Code/Editor/Controls/ReflectedPropertyControl/ReflectedPropertyCtrl.cpp

@@ -671,7 +671,7 @@ AzToolsFramework::PropertyRowWidget* ReflectedPropertyControl::FindPropertyRowWi
         return nullptr;
     }
     const AzToolsFramework::ReflectedPropertyEditor::WidgetList& widgets = m_editor->GetWidgets();
-    for (auto instance : widgets)
+    for (const auto& instance : widgets)
     {
         if (instance.second->label() == item->GetPropertyName())
         {