Removes cortical borers. No, I am not sorry. (#18161)

* Removes cortical borers. No, I am not sorry.

* Icon purge

code/__DEFINES/combat.dm

@@ -48,7 +48,7 @@
 #define CANWEAKEN		2
 #define CANPARALYSE		4
 #define CANPUSH			8
-#define PASSEMOTES		16 //Mob has a cortical borer or holders inside of it that need to see emotes.
+#define PASSEMOTES		16 //Mob has holders inside of it that need to see emotes.
 #define GODMODE			32
 
 //Health Defines

code/__DEFINES/gamemode.dm

@@ -24,7 +24,6 @@
 #define SPECIAL_ROLE_ABDUCTOR_SCIENTIST "Abductor Scientist"
 #define SPECIAL_ROLE_BLOB "Blob"
 #define SPECIAL_ROLE_BLOB_OVERMIND "Blob Overmind"
-#define SPECIAL_ROLE_BORER "Borer"
 #define SPECIAL_ROLE_CHANGELING "Changeling"
 #define SPECIAL_ROLE_CULTIST "Cultist"
 #define SPECIAL_ROLE_DEATHSQUAD "Death Commando"

code/__DEFINES/role_preferences.dm

@@ -28,7 +28,6 @@
 #define ROLE_TRADER				"trader"
 #define ROLE_VAMPIRE			"vampire"
 // Role tags for EVERYONE!
-#define ROLE_BORER				"cortical borer"
 #define ROLE_DEMON				"slaughter demon"
 #define ROLE_SENTIENT			"sentient animal"
 #define ROLE_POSIBRAIN			"positronic brain"
@@ -54,7 +53,6 @@ GLOBAL_LIST_INIT(special_roles, list(
 	ROLE_ABDUCTOR = /datum/game_mode/abduction, 		// Abductor
 	ROLE_BLOB = /datum/game_mode/blob, 					// Blob
 	ROLE_CHANGELING = /datum/game_mode/changeling, 		// Changeling
-	ROLE_BORER, 										// Cortical borer
 	ROLE_CULTIST = /datum/game_mode/cult, 				// Cultist
 	ROLE_GSPIDER, 										// Giant spider
 	ROLE_GUARDIAN, 										// Guardian

code/__DEFINES/rolebans.dm

@@ -10,7 +10,6 @@ GLOBAL_LIST_INIT(antag_roles, list(
 	ROLE_BLOB,
 	ROLE_NINJA,
 	ROLE_VAMPIRE,
-	ROLE_BORER,
 	ROLE_DEMON,
 	ROLE_REVENANT,
 	ROLE_GUARDIAN,