Adds a Hardliner faction datum. (#3765)

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## About The Pull Request
Title.
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## Why It's Good For The Game
Three Hardliner ships are open (#3761, #3744, #3741) and all are using
the base syndicate faction. What a shame.
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## Changelog

:cl:
code: Added a Hardliner faction datum.
/:cl:

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_maps/configs/syndicate_gorlex_komodo.json

@@ -1,5 +1,5 @@
 {
-	"faction": "/datum/faction/syndicate",
+	"faction": "/datum/faction/syndicate/hardliners",
 	"prefix": "ISV",
 	"namelists": [
 		"GORLEX",

code/__DEFINES/factions.dm

@@ -16,6 +16,7 @@
 #define FACTION_SYNDICATE "Syndicate"
 	#define FACTION_NGR "New Gorlex Republic"
 	#define FACTION_CYBERSUN "CyberSun"
+	#define FACTION_HARDLINERS "Hardliners"
 	#define FACTION_SUNS "Student-Union of Naturalistic Sciences"
 #define FACTION_SOLGOV "SolGov"
 #define FACTION_SRM "Saint-Roumain Militia"
@@ -31,6 +32,7 @@
 #define PREFIX_SYNDICATE list("SEV", "SSV")
 	#define PREFIX_NGR list("NGRV")
 	#define PREFIX_CYBERSUN list("CSSV")
+	#define PREFIX_HARDLINERS list("ISV")
 	#define PREFIX_SUNS list("SUNS")
 #define PREFIX_SOLGOV list("SCSV")
 #define PREFIX_SRM list("SRSV")

code/modules/faction/faction_datum.dm

@@ -24,6 +24,10 @@
 	name = FACTION_CYBERSUN
 	prefixes = PREFIX_CYBERSUN
 
+/datum/faction/syndicate/hardliners
+	name = FACTION_HARDLINERS
+	prefixes = PREFIX_HARDLINERS
+
 /datum/faction/syndicate/suns
 	name = FACTION_SUNS
 	short_name = "SUNS"