Cleanup SerializeContext.h pt.1 (#4264)

* Remove AssetSerializer inclusion from SerializeContext header

Moved a few Reflect methods to new cpp files.

In addition, some preparations for further header dependency reductions.

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

* Fix smoke test lua failures.

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

* Windows build fixes.

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

* Missing license headers

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

* Fix white-space issues.

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

* Code review fix for AzToolsFramework/AssetEditor/AssetEditorBus.h

Co-authored-by: lumberyard-employee-dm <56135373+lumberyard-employee-dm@users.noreply.github.com>
Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Fix inheritance list wrapping broken by older clang-format

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

Co-authored-by: lumberyard-employee-dm <56135373+lumberyard-employee-dm@users.noreply.github.com>

Code/Tools/SceneAPI/SceneCore/Containers/GraphObjectProxy.h

@@ -12,6 +12,10 @@
 
 namespace AZ
 {
+    struct BehaviorParameter;
+    struct BehaviorValueParameter;
+    class BehaviorClass;
+
     namespace Python
     {
         class PythonBehaviorInfo;

Code/Tools/SceneAPI/SceneCore/Containers/SceneManifest.cpp

@@ -18,6 +18,7 @@
 #include <AzCore/JSON/document.h>
 #include <AzCore/JSON/prettywriter.h>
 #include <AzCore/Memory/SystemAllocator.h>
+#include <AzCore/RTTI/BehaviorContext.h>
 #include <AzCore/Serialization/Json/RegistrationContext.h>
 #include <AzCore/Serialization/Json/JsonSerialization.h>
 #include <AzCore/Serialization/Json/JsonSerializationResult.h>