Adds Golden Deep accents (#19520)

Sprites by whitewolftamer and descriptions by Noble Row.

code/modules/background/accent/silicon.dm

@@ -3,3 +3,15 @@
 	description = "A barebones text-to-speech accent. This is usually used to de-humanize or to cut speech synthesizer costs in silicon based machines."
 	tag_icon = "tts"
 	text_tag = "TTS"
+
+/datum/accent/silicon/goldendeep
+	name = ACCENT_MERCHANT
+	description = "The Merchant accent is a custom made invention from Golden Deep space to celebrate the affluent members of the collective. Sounding somewhat like a symphony and speech coalescing in a scenic pattern to make something literally 'music to one's ears'. This accent package is known to be exceedingly expensive for something so trivial and is reserved for only those of the Merchant class of the Golden Deep and synthetics above."
+	tag_icon = "gold_merchant"
+	text_tag = "THN"
+
+/datum/accent/silicon/goldendeep/thesian
+	name = ACCENT_THESIAN
+	description = "The Thesian accent is a custom made invention from Golden Deep space to represent the more standard members of the collective. A mix between a symphony and the standard 'Text-To-Speech' variation that is found in the other synthetics of the Orion Spur. This voice package is a bit more jarring and is significantly cheaper than its richer Merchant cousin, but brings a vocal identity to its bearer to help one acclimate to a new home within the foreign horizons. "
+	tag_icon = "gold_thesian"
+	text_tag = "MER"

code/modules/background/origins/origins/ipc/golden_deep.dm

@@ -9,6 +9,6 @@
 	name = "Golden Deep"
 	desc = "An IPC merchant collective organised for the purpose of making as much money as possible. Originating as a group of escaped IPCs in the Frontier, they have since returned to Biesel and the Coalition, plying their trade and accepting new members into their ranks. Three notable groups exist in their ranks, the ultra-artistic Joint Venture Ultra-Maz, the knowledge-hungry Grand Camarilla Estriconian, and the crafty and manipulative Zaibatsu. In keeping with their name, members of the organisation frequently exhibit a desire for wealth and a penchant for flaunting it, often through copious amounts of gold."
 	important_information = "Golden Deep citizenship exists to denote an IPC as a member of the organisation, but it can still be noted in records that the IPC holds a normal citizenship (for instance, an IPC may be a citizen of Biesel and a member of Golden Deep.)"
-	possible_accents = ACCENTS_ALL_IPC
+	possible_accents = list(ACCENT_MERCHANT, ACCENT_THESIAN, ACCENT_CETI, ACCENT_TTS, ACCENT_XANU, ACCENT_COC, ACCENT_ELYRA, ACCENT_ERIDANI, ACCENT_ERIDANIDREG, ACCENT_ERIDANIREINSTATED, ACCENT_SOL, ACCENT_SILVERSUN_EXPATRIATE, ACCENT_SILVERSUN_ORIGINAL, ACCENT_PHONG, ACCENT_MARTIAN, ACCENT_KONYAN, ACCENT_LUNA, ACCENT_GIBSON_OVAN, ACCENT_GIBSON_UNDIR, ACCENT_HIMEO, ACCENT_VYSOKA, ACCENT_VENUS, ACCENT_VENUSJIN, ACCENT_JUPITER, ACCENT_CALLISTO, ACCENT_EUROPA, ACCENT_EARTH, ACCENT_NCF, ACCENT_PLUTO, ACCENT_ASSUNZIONE, ACCENT_VISEGRAD, ACCENT_SANCOLETTE, ACCENT_VALKYRIE, ACCENT_MICTLAN, ACCENT_PERSEPOLIS, ACCENT_MEDINA, ACCENT_NEWSUEZ, ACCENT_AEMAQ, ACCENT_DAMASCUS)
 	possible_citizenships = list(CITIZENSHIP_GOLDEN)
 	possible_religions = RELIGIONS_ALL_IPC