First version of the slice-to-prefab converter

It converts .slice and .ly files to .prefab files, but doesn't handle nested or complicated slices correctly yet.

Code/Tools/SerializeContextTools/serializecontexttools_files.cmake

@@ -17,6 +17,8 @@ set(FILES
     Dumper.h
     Dumper.cpp
     main.cpp
+    SliceConverter.h
+    SliceConverter.cpp
     Utilities.h
     Utilities.cpp
 )