kills Debug and Debug2 all hail debugging_enabled (#94002)

## About The Pull Request
renames Debug2 and kills Debug as its last use (atleast the one
described in its comment) was removed
added it to the check to print to print stack traces to chat in the
instance your debugging without a debugger attached for some reason (if
this var is enabled on live it already causes random to_world messages,
kinda fuck it we ball at that point)
## Why It's Good For The Game
The first one was ENTIRELY unused now
this name makes more sense
## Changelog
N/A

code/controllers/subsystem/explosions.dm

@@ -472,8 +472,7 @@ ADMIN_VERB(check_bomb_impacts, R_DEBUG, "Check Bomb Impact", "See what the effec
 	var/took = (REALTIMEOFDAY - started_at) / 10
 
 	//You need to press the DebugGame verb to see these now....they were getting annoying and we've collected a fair bit of data. Just -test- changes to explosion code using this please so we can compare
-	if(GLOB.Debug2)
-		log_world("## DEBUG: Explosion([x0],[y0],[z0])(d[devastation_range],h[heavy_impact_range],l[light_impact_range]): Took [took] seconds.")
+	debug_world("Explosion([x0],[y0],[z0])(d[devastation_range],h[heavy_impact_range],l[light_impact_range]): Took [took] seconds.")
 
 	explosion_index += 1
 

code/controllers/subsystem/ticker.dm

@@ -229,7 +229,7 @@ SUBSYSTEM_DEF(ticker)
 	can_continue = can_continue && SSjob.divide_occupations() //Distribute jobs
 	CHECK_TICK
 
-	if(!GLOB.Debug2)
+	if(!GLOB.debugging_enabled)
 		if(!can_continue)
 			log_game("Game failed pre_setup")
 			to_chat(world, "<B>Error setting up game.</B> Reverting to pre-game lobby.")