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.hpp

@@ -1,6 +1,7 @@
 #pragma once
 #include "duration-control.hpp"
 #include "macro-script-handler.hpp"
+#include "sync-helpers.hpp"
 
 #include <atomic>
 #include <obs-data.h>
@@ -11,7 +12,7 @@ class Macro;
 class MacroAction;
 class MacroCondition;
 
-class MacroSegmentScript {
+class MacroSegmentScript : public Lockable {
 public:
 	MacroSegmentScript(obs_data_t *defaultSettings,
 			   const std::string &propertiesSignalName,