Updated MAC Core public helper API to `mac_core_` prefix
- Standardized the documented public helper wrappers on the
mac_core_*prefix before the first stable release. - Shipped the helper surface as
mac_core_format_datetime(),mac_core_format_price(),mac_core_count_array_items(),mac_core_get_post_type_label(),mac_core_get_taxonomy_label(),mac_core_get_post_terms(),mac_core_get_plugin_status(), andmac_core_get_theme_status(). - Removed the earlier short-form public helper naming from the stable contract instead of carrying forward parallel aliases.
- Aligned the stable helper namespace with the existing
mac_core_*settings, hooks, and option naming used elsewhere in the plugin.