Started mutation maintenance scripts

Started mutation maintenance scripts.

_content/ga_scripts/mut_m_darkvision.nss

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+//::////////////////////////////////////////////////////////////////////////////
+//:: Name		Darkvision template maintain script
+//:: FileName	mut_m_darkvision.nss
+//:: Copyright	(c) 2022 NWNDS
+//::////////////////////////////////////////////////////////////////////////////
+/*
+Darkvision (Physical / Plant)
+The character has an extraordinary ability to see in darkness without requiring 
+a light source, such as at night or underground. Vision is black-and-white only. 
+The presence of light does not spoil darkvision. 
+
+*/
+//::////////////////////////////////////////////////////////////////////////////
+//:: Created By: Jaysyn
+//:: Created On: 22/03/23
+//::////////////////////////////////////////////////////////////////////////////
+
+
+#include "prc_alterations"
+#include "prc_inc_template"
+#include "prc_racial_const"
+
+void main()
+{
+
+//:: Declare major variables
+	object oPC = OBJECT_SELF;
+	object oSkin = GetPCSkin(oPC);
+	int iHD = GetHitDice(oPC);
+	int nBonus;
+	itemproperty ipIP;
+	
+//:: Darkvision
+    ipIP = PRCItemPropertyBonusFeat(IP_CONST_FEAT_DARKVISION);
+    IPSafeAddItemProperty(oSkin, ipIP, 0.0, X2_IP_ADDPROP_POLICY_KEEP_EXISTING, FALSE, FALSE);
+	
+//:: Marker Feat
+    ipIP = PRCItemPropertyBonusFeat(IP_CONST_FEAT_MUT_DARKVISION);
+    IPSafeAddItemProperty(oSkin, ipIP, 0.0, X2_IP_ADDPROP_POLICY_KEEP_EXISTING, FALSE, FALSE);
+}