NTSL2++ sucessor to NTSL2+ (#9321)

This drastcly is meant to rework DM and Daemon code to allow further expansion and replacement of custom engine with JavaScript language based engine.

Daemon PR - Aurorastation/ByondInterpretedLanguage#7

Forums topic for discussion - https://forums.aurorastation.org/topic/14570-ntsl2-and-its-future/

Superseeds #8817

code/modules/ntsl2/ntsl2_program.dm

@@ -0,0 +1,27 @@
+/*
+Datum representing program state on deamon and exposing apropriate procs to DM. 
+*/
+/datum/ntsl2_program/
+	var/id = 0
+	var/name = "Base NTSL2++ program"
+	var/list/ready_tasks = list()
+
+
+/datum/ntsl2_program/New()
+	..()
+
+/datum/ntsl2_program/proc/is_ready()
+	return !!id
+
+/datum/ntsl2_program/proc/kill()
+	if(is_ready())
+		SSntsl2.send_task("remove", list(id = id))
+	SSntsl2.handle_termination(src)
+	qdel(src)
+	
+/datum/ntsl2_program/proc/execute(var/script, var/mob/user)
+	if(!is_ready())
+		ready_tasks += CALLBACK(src, .proc/execute, script, user)
+		return FALSE // We are not ready to run code
+	log_ntsl("[user.name]/[user.key] uploaded script to [src] : [script]", SEVERITY_NOTICE, user.ckey)
+	return SSntsl2.send_task("execute", list(id = id, code = script), program = src)