Refactor locking of macro segments

This should avoid crashes when actions or conditions are performed in
parallel to the main macro loop and will improve the UI responsiveness
in some scenarios

plugins/scripting/macro-segment-script-inline.hpp

@@ -1,13 +1,14 @@
 #pragma once
 #include "file-selection.hpp"
 #include "inline-script.hpp"
+#include "sync-helpers.hpp"
 #include "variable-text-edit.hpp"
 
 #include <QLayout>
 
 namespace advss {
 
-class MacroSegmentScriptInline {
+class MacroSegmentScriptInline : public Lockable {
 public:
 	InlineScript::Type GetType() const { return _script.GetType(); }
 	void SetType(InlineScript::Type);