RNA: Allow structs to define tags for their properties

Adds support for defining a number of tags as part of the rna-struct
definition, which its properties can set similar to property-flags.
BPY supports setting these tags when defining custom properties too.

* To define tags for a struct (which its properties can use then), define the tags in an `EnumPropertyItem` array, and assign them to the struct using `RNA_def_struct_property_tags(...)`.
* To set tags for an RNA-property in C, use the new `RNA_def_property_tags(...)`.
* To set tags for an RNA-property in Python, use the newly added tags parameter. E.g. `bpy.props.FloatProperty(name="Some Float", tags={'SOME_TAG', 'ANOTHER_TAG'})`.

Actual usage of this will be added in a follow-up commit.

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/makesrna/RNA_access.h b/source/blender/makesrna/RNA_access.h
index ed1795fd39c..9aabf1b70dc 100644
--- a/source/blender/makesrna/RNA_access.h
+++ b/source/blender/makesrna/RNA_access.h
@@ -761,6 +761,7 @@ const char *RNA_struct_translation_context(const StructRNA *type);
 int RNA_struct_ui_icon(const StructRNA *type);
 
 PropertyRNA *RNA_struct_name_property(const StructRNA *type);
+const EnumPropertyItem *RNA_struct_property_tag_defines(const StructRNA *type);
 PropertyRNA *RNA_struct_iterator_property(StructRNA *type);
 StructRNA *RNA_struct_base(StructRNA *type);
 const StructRNA *RNA_struct_base_child_of(const StructRNA *type, const StructRNA *parent_type);
@@ -816,6 +817,7 @@ PropertyType RNA_property_type(PropertyRNA *prop);
 PropertySubType RNA_property_subtype(PropertyRNA *prop);
 PropertyUnit RNA_property_unit(PropertyRNA *prop);
 int RNA_property_flag(PropertyRNA *prop);
+int RNA_property_tags(PropertyRNA *prop);
 bool RNA_property_builtin(PropertyRNA *prop);
 void *RNA_property_py_data_get(PropertyRNA *prop);
 
@@ -852,6 +854,7 @@ bool RNA_enum_name(const EnumPropertyItem *item, const int value, const char **r
 bool RNA_enum_description(const EnumPropertyItem *item, const int value, const char **description);
 int  RNA_enum_from_value(const EnumPropertyItem *item, const int value);
 int  RNA_enum_from_identifier(const EnumPropertyItem *item, const char *identifier);
+unsigned int RNA_enum_items_count(const EnumPropertyItem *item);
 
 void RNA_property_enum_items_ex(
         struct bContext *C, PointerRNA *ptr, PropertyRNA *prop, const bool use_static,