Remove legacy serialization and QPropertyTree (#684)

Remove:
- CryCommon/CryExtension/*
- CryCommon/Serialization/*
- Sandbox/Plugins/EditorCommon/QPropertyTree/*
- All related CryCommon interfaces
- All CrySystem implementations
- Various related Editor classes

Code/Sandbox/Editor/editor_lib_files.cmake

@@ -357,8 +357,6 @@ set(FILES
     Controls/ConsoleSCB.h
     Controls/ConsoleSCB.ui
     Controls/ConsoleSCB.qrc
-    Controls/CurveEditorCtrl.cpp
-    Controls/CurveEditorCtrl.h
     Controls/FolderTreeCtrl.cpp
     Controls/FolderTreeCtrl.h
     Controls/HotTrackingTreeCtrl.cpp
@@ -575,11 +573,6 @@ set(FILES
     QtUI/WaitCursor.cpp
     RenderHelpers/AxisHelper.cpp
     RenderHelpers/AxisHelper.h
-    Serialization.h
-    Serialization/VariableOArchive.cpp
-    Serialization/VariableOArchive.h
-    Serialization/VariableIArchive.cpp
-    Serialization/VariableIArchive.h
     CustomizeKeyboardDialog.h
     CustomizeKeyboardDialog.cpp
     CustomizeKeyboardDialog.ui
@@ -738,8 +731,6 @@ set(FILES
     TrackView/TrackViewEventNode.h
     ConfigGroup.cpp
     ConfigGroup.h
-    SettingsBlock.cpp
-    SettingsBlock.h
     Util/AffineParts.h
     Util/AutoLogTime.cpp
     Util/AutoLogTime.h