Core RT - Conditioal Append: Conditional Addition of Content Parts

Added "Conditional Append" Core-Replacement Tag

{COND_APPEND:cat_id,cat_id,cat_id:cp_id}

FUNCTION: 
IF ACTIVE CATEGORY EQUALS OR IS BELOW OF ONE OF THOSE DEFINED IN THE TAG:("cat_id")
THEN SHOW THE CONTENT PART SPECIFIED WITHIN THE TAG ("cp_id")
YOU CAN USE MULTIPLE CATEGORIES SEPERATED BY COMMA

AUTHOR: Konstantin Schultes - www.enym.com