special_role/objective refactor

Refactored most instances of special_role setting/checking to use new
SPECIAL_ROLE_X defines in code/__DEFINES/gamemode.dm

Removed relative pathing from objective.dm and split large if statements
into multiple, plus a bunch of styling fixes

Refactored every instance of `istype(ticker.mode` into a GAMEMODE_IS_X
define in code/__DEFINES/gamemode.dm. Done primarily for when someone gets
around to making gamemode code less AWFUL

code/game/gamemodes/blob/blobs/core.dm

@@ -91,7 +91,7 @@
 /obj/effect/blob/core/proc/create_overmind(var/client/new_overmind, var/override_delay)
 	if(overmind_get_delay > world.time && !override_delay)
 		return
-	
+
 	overmind_get_delay = world.time + 3000 // 5 minutes
 
 	if(overmind)
@@ -99,7 +99,7 @@
 
 	var/mob/C = null
 	var/list/candidates = list()
-	
+
 	spawn()
 		if(!new_overmind)
 			candidates = pollCandidates("Do you want to play as a blob?", ROLE_BLOB, 1)
@@ -115,7 +115,7 @@
 			src.overmind = B
 			color = overmind.blob_reagent_datum.color
 			if(B.mind && !B.mind.special_role)
-				B.mind.special_role = "Blob Overmind"
+				B.mind.special_role = SPECIAL_ROLE_BLOB_OVERMIND
 			spawn(0)
 				if(is_offspring)
 					B.verbs -= /mob/camera/blob/verb/split_consciousness