Modifiers: add StructRNA pointer field to ModifierTypeInfo

This reduces the number of places that have to be modified
when a new modifier is added.

Reviewers: campbellbarton

Differential Revision: https://developer.blender.org/D9000

source/blender/modifiers/intern/MOD_cloth.c

@@ -284,6 +284,7 @@ ModifierTypeInfo modifierType_Cloth = {
     /* name */ "Cloth",
     /* structName */ "ClothModifierData",
     /* structSize */ sizeof(ClothModifierData),
+    /* srna */ &RNA_ClothModifier,
     /* type */ eModifierTypeType_OnlyDeform,
     /* flags */ eModifierTypeFlag_AcceptsMesh | eModifierTypeFlag_UsesPointCache |
         eModifierTypeFlag_Single,