Buildable (#36)

- Buildable missions now working. 
- FARPS and BLUESAM zones are now buildable. 
- Secondary Logistics missions are created as buildables become available. 
- Logistic missions can be "marked" with a MAP marker. 
- Supplies can only be picked up in a SUPPLYHUB zone. 
- SUPPLYHUB zones are active once their parents are active. A supplyhub parent can be oneof: FARP, AIRBASE, STAGE. 
- Required supplies for a zone can be configured in kilos. 
- Crates can be picked up with 1000 or 2000 kilo per crate. 
- Max load for a helicopter is set based on public data. 
- TO COME: Sling load options

classes/stageClasses/Groups/SpearheadGroup.lua

@@ -21,6 +21,10 @@ function SpearheadGroup.New(groupName)
     return self
 end
 
+function SpearheadGroup:IsSpawned()
+    return self._isSpawned
+end
+
 function SpearheadGroup:SpawnCorpsesOnly()
 
     if self._isSpawned == true then return end
@@ -146,6 +150,26 @@ function SpearheadGroup:GetUnits()
     return result
 end
 
+---@return Array<Vec3>
+function SpearheadGroup:GetAllUnitPositions()
+
+     local result = {}
+    if self._isStatic == true then
+        local staticObject = StaticObject.getByName(self.groupName)
+        if staticObject then 
+            table.insert(result, staticObject:getPoint())
+        end
+    else
+        local group = Group.getByName(self.groupName)
+        if not group then return {} end
+        for _, unit in pairs(group:getUnits()) do
+            table.insert(result, unit:getPoint())
+        end 
+    end
+    return result
+
+end
+
 if not Spearhead.classes then Spearhead.classes = {} end
 if not Spearhead.classes.stageClasses then Spearhead.classes.stageClasses = {} end
 if not Spearhead.classes.stageClasses.Groups then Spearhead.classes.stageClasses.Groups = {} end