Fix/cas mission2 (#44)

* changed from only units to also statics in targets for CAS

* added statics and update docs

* optimised hull creation and did not group by group

* added cas_mission.png

---------

Co-authored-by: dutchie032 <dutchie032>
Co-authored-by: ex61wi <tim.rorije@ing.com>

classes/stageClasses/Groups/SpearheadGroup.lua

@@ -156,7 +156,6 @@ function SpearheadGroup:GetObjects()
     return result
 end
 
-
 ---comment
 ---@return Array<Unit> result list of objects
 function SpearheadGroup:GetAsUnits()
@@ -195,15 +194,21 @@ end
 
 function SpearheadGroup:SetInvisible()
 
-    local group = Group.getByName(self.groupName)
-    if group then
-        local setInvisible = {
-            id = 'SetInvisible',
-            params = {
-                value = true
+    if self._isStatic == true then
+        local country = Spearhead.DcsUtil.GetNeutralCountry()
+        Spearhead.DcsUtil.SpawnGroupTemplate(self.groupName, nil, nil, nil, country)
+    else
+        local group = Group.getByName(self.groupName)
+        if group then
+            local setInvisible = {
+                id = 'SetInvisible',
+                params = {
+                    value = true
+                }
             }
-        }
-        group:getController():setCommand(setInvisible)
+            group:getController():setCommand(setInvisible)
+        end
+
     end
 end