chore: add assetrefs to other games

src/ZoneCode/Game/T5/XAssets/FxEffectDef.txt

@@ -38,6 +38,7 @@ set condition material FxElemDef::elemType == FX_ELEM_TYPE_SPRITE_BILLBOARD
 use FxEffectDefRef;
 set condition handle never;
 set string name;
+set assetref name ASSET_TYPE_FX;
 
 // FxTrailDef
 use FxTrailDef;

src/ZoneCode/Game/T5/XAssets/WeaponVariantDef.txt

@@ -9,6 +9,7 @@ set reusable weapDef;
 set string szDisplayName;
 set string szAltWeaponName;
 set string szXAnims;
+set assetref szXAnims ASSET_TYPE_XANIMPARTS;
 set count szXAnims NUM_WEAP_ANIMS;
 set reusable szXAnims;
 set scriptstring hideTags;