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/spearhead_base.lua

@@ -206,6 +206,22 @@ do -- INIT UTIL
         return false
     end
 
+    ---@param point Vec2
+    ---@param zone SpearheadTriggerZone
+    function UTIL.is2dPointInZone(point, zone)
+        if zone.zone_type == "Polygon" and zone.verts then
+            if UTIL.IsPointInPolygon(zone.verts, point.x, point.y) == true then
+                return true
+            end
+        else
+            if (((point.x - zone.location.x) ^ 2 + (point.y - zone.location.y) ^ 2) ^ 0.5 <= zone.radius) then
+                return true
+            end
+        end
+
+        return false
+    end
+
     ---comment
     ---@param points Array<Vec2> points 
     ---@return Array<Vec2> hullPoints
@@ -974,6 +990,27 @@ do     -- INIT DCS_UTIL
         return drawID
     end
 
+    
+    local _markID = 200
+
+    ---@param groupID number
+    ---@param text string
+    ---@param location Vec3
+    ---@return number markID
+    function DCS_UTIL.AddMarkToGroup(groupID, text, location)
+
+        _markID = _markID + 1
+        trigger.action.markToGroup(_markID, text, location, groupID, true, nil)
+        return _markID
+    end
+
+    ---@param markId number
+    function DCS_UTIL.RemoveMark(markId)
+        if markId ~= nil then
+            trigger.action.removeMark(markId)
+        end
+    end
+
     ---comment
     ---@param drawID number
     ---@param lineColor DrawColor
@@ -1092,6 +1129,19 @@ do     -- INIT DCS_UTIL
         end
     end
 
+    ---@param unitID number
+    ---@return Unit?
+    function DCS_UTIL.GetPLayerUnitByID(unitID)
+        for i = 0, 2 do
+            local players = coalition.getPlayers(i)
+            for key, unit in pairs(players) do
+                if unit and unit:getID() == unitID then
+                    return unit
+                end
+            end
+        end
+    end
+
     DCS_UTIL.__INIT();
 end
 Spearhead.DcsUtil = DCS_UTIL