rework modifier key, cleanup sandbags, tripod, ladder, fix #2590

addons/common/functions/fnc_handleModifierKey.sqf

@@ -0,0 +1,17 @@
+/*
+ * Author: commy2
+ * Handles key down event for modifier key.
+ *
+ * Arguments:
+ * None
+ *
+ * Return Value:
+ * None
+ *
+ * Public : No
+ */
+#include "script_component.hpp"
+
+if (_this select 3) then {ACE_modifier = 1};
+
+false