Property access rights

• read - Property can be read
• write - Property can be written
• readwrite - Property can be read and written

enum @extern Eldbus.Introspection.Property_Access {
    read: 0,
    write,
    readwrite
}

typedef enum {
    ELDBUS_INTROSPECTION_PROPERTY_ACCESS_READ = 0,
    ELDBUS_INTROSPECTION_PROPERTY_ACCESS_WRITE,
    ELDBUS_INTROSPECTION_PROPERTY_ACCESS_READWRITE
} Eldbus_Introspection_Property_Access;