feat(optics): add standalone air flir addon

braf_optics_air/braf_fnc/fn_shutdownRSC.sqf

@@ -0,0 +1,16 @@
+/*
+    Author: Brazilian Armed Forces
+    File: fn_shutdownRSC.sqf
+
+    Purpose:
+      - Stop the EachFrame loop and clear the generic air FLIR runtime state
+*/
+
+private _pfh = uiNamespace getVariable ["BRAF_FLIR_PFH_eachFrame", -1];
+
+if (_pfh > -1) then {
+    removeMissionEventHandler ["EachFrame", _pfh];
+};
+
+uiNamespace setVariable ["BRAF_FLIR_PFH_eachFrame", nil];
+uiNamespace setVariable ["BRAF_FLIR_UI_Display", nil];