add functions for getting swarm info and corkscrew info

Apparently virtvars can only return one value.  This deprecates the virtvars and adds function equivalents for getting weapon class swarm info and corkscrew info.  Fixes a bug reported by Woolie Wool in Discord.

Author: Goober5000

code/scripting/api/objs/weaponclass.cpp

@@ -336,8 +336,7 @@ ADE_VIRTVAR(FreeFlightTime, l_Weaponclass, "number", "The time the weapon will f
 	return ade_set_args(L, "f", Weapon_info[idx].free_flight_time);
 }
 
-ADE_VIRTVAR(SwarmInfo, l_Weaponclass, nullptr, nullptr, "boolean, number, number", 
-	"If the weapon has the swarm flag , the number of swarm missiles, the swarm wait. Returns nil if the handle is invalid.")
+static int swarm_info_helper(lua_State* L)
 {
 	int idx;
 	if (!ade_get_args(L, "o", l_Weaponclass.Get(&idx)))
@@ -357,8 +356,20 @@ ADE_VIRTVAR(SwarmInfo, l_Weaponclass, nullptr, nullptr, "boolean, number, number
 	return ade_set_args(L, "bii", flag, Weapon_info[idx].swarm_count, Weapon_info[idx].SwarmWait);
 }
 
-ADE_VIRTVAR(CorkscrewInfo, l_Weaponclass, nullptr, nullptr, "boolean, number, number, number, boolean, number", 
-	"If the weapon has the corkscrew flag, the number of corkscrew missiles fired, the radius, the fire delay, counter rotate settings, the twist value. Returns nil if the handle is invalid.")
+ADE_VIRTVAR_DEPRECATED(SwarmInfo, l_Weaponclass, nullptr, nullptr, "boolean",
+	"Returns whether the weapon has the swarm flag, or nil if the handle is invalid.",
+	gameversion::version(24, 2), "Deprecated in favor of weaponclass:getSwarmInfo(), since virtvars can only return a single value.")
+{
+	return swarm_info_helper(L);
+}
+
+ADE_FUNC(getSwarmInfo, l_Weaponclass, nullptr, nullptr, "boolean, number, number",
+	"Returns three values: a) whether the weapon has the swarm flag, b) the number of swarm missiles fired, c) the swarm wait. Returns nil if the handle is invalid.")
+{
+	return swarm_info_helper(L);
+}
+
+static int corkscrew_info_helper(lua_State* L)
 {
 	int idx;
 	if (!ade_get_args(L, "o", l_Weaponclass.Get(&idx)))
@@ -389,6 +400,19 @@ ADE_VIRTVAR(CorkscrewInfo, l_Weaponclass, nullptr, nullptr, "boolean, number, nu
 		Weapon_info[idx].cs_twist);
 }
 
+ADE_VIRTVAR_DEPRECATED(CorkscrewInfo, l_Weaponclass, nullptr, nullptr, "boolean, number, number, number, boolean, number",
+	"Returns whether the weapon has the corkscrew flag, or nil if the handle is invalid.",
+	gameversion::version(24, 2), "Deprecated in favor of weaponclass:getCorkscrewInfo(), since virtvars can only return a single value.")
+{
+	return corkscrew_info_helper(L);
+}
+
+ADE_FUNC(getCorkscrewInfo, l_Weaponclass, nullptr, nullptr, "boolean, number, number, number, boolean, number",
+	"Returns five values: a) whether the weapon has the corkscrew flag, b) the number of corkscrew missiles fired, c) the radius, d) the fire delay, e) whether the weapon counter-rotations, f) the twist value. Returns nil if the handle is invalid.")
+{
+	return corkscrew_info_helper(L);
+}
+
 ADE_VIRTVAR(LifeMax, l_Weaponclass, "number", "Life of weapon in seconds", "number", "Life of weapon, or 0 if handle is invalid")
 {
 	int idx;