chore: add qqsfpm::registerTypes()

Under some circumstances, auto-registration doesn't work,
call this function to ensure types are registered.

CMakeLists.txt

@@ -12,6 +12,7 @@ set(CMAKE_INCLUDE_CURRENT_DIR ON) # This is to find generated *.moc and *.h file
 
 add_library(SortFilterProxyModel OBJECT
     qqmlsortfilterproxymodel.cpp
+    qqmlsortfilterproxymodeltypes.cpp
     filters/filter.cpp
     filters/filtercontainer.cpp
     filters/rolefilter.cpp

qqmlsortfilterproxymodeltypes.cpp

@@ -0,0 +1,15 @@
+#include "qqmlsortfilterproxymodeltypes.h"
+
+namespace qqsfpm {
+extern void registerQQmlSortFilterProxyModelTypes();
+extern void registerFiltersTypes();
+extern void registerSorterTypes();
+extern void registerProxyRoleTypes();
+} // namespace qqsfpm
+
+void qqsfpm::registerTypes() {
+  registerQQmlSortFilterProxyModelTypes();
+  registerFiltersTypes();
+  registerSorterTypes();
+  registerProxyRoleTypes();
+}

qqmlsortfilterproxymodeltypes.h

@@ -0,0 +1,5 @@
+#pragma once
+
+namespace qqsfpm {
+void registerTypes();
+}