Added "airbase strike" OCA mission objective

Database/Tasks/OCAAirbase.lua

@@ -0,0 +1,26 @@
+Library.tasks.ocaAirbase = {
+   taskFamily = DCSEx.enums.taskFamily.OCA,
+   description =
+   {
+      briefing = {
+         "Neutralizing this enemy airbase will eliminate their ability to conduct sustained air sorties and restore local air superiority.",
+         "Taking out this airbase will disrupt their logistics and sortie tempo, buying time for our ground forces to consolidate.",
+         "This airbase is the hub of enemy reconnaissance and close air support—removing it reduces battlefield intelligence and strike pressure.",
+         "Outlasting enemy air campaign requires degrading that facility's operational capacity to prevent rotational sorties.",
+         "Disabling this node of their air network constrains their command-and-control reach and limits coordinated strikes."
+      },
+      short = "Destroy enemy airbase",
+   },
+   conditions = {
+      difficultyMinimum = 0,
+      eras = {},
+   },
+   completionEvent = DCSEx.enums.taskEvent.DESTROY,
+   flags = { DCSEx.enums.taskFlag.ALLOW_JTAC, DCSEx.enums.taskFlag.AIRBASE_TARGET },
+   minimumDistance = DCSEx.converter.nmToMeters(10.0),
+   safeRadius = 100,
+   surfaceType = land.SurfaceType.LAND,
+   targetCount = { 1, 1 },
+   targetFamilies = { DCSEx.enums.unitFamily.STATIC_SCENERY },
+   waypointInaccuracy = 0.0
+}