To insert lua into a map:
      Create 2 entities (Trigger_Start, Trigger_IF)
      Give a name for Trigger_IF
      Set trigger for Trigger_Start to the name of Trigger_IF
      Put your lua around these tags

      Go to this website
      Paste your script in the first text field
      Click remove line breaks
      Copy the output into the condition box of the if trigger

There you have it, placing lua within maps. Hopefully DC will add an entity called ENV_Lua where you can place insert lua without the wrappers.