API: Change macOS raise mechanism

Other mechanism didn't work universally

scripting/python_manager.h

@@ -34,7 +34,15 @@ class KICOMMON_API PYTHON_MANAGER
 public:
     PYTHON_MANAGER( const wxString& aInterpreterPath );
 
-    void Execute( const wxString& aArgs,
+    /**
+     * Launches the Python interpreter with the given arguments
+     * @param aArgs
+     * @param aCallback
+     * @param aEnv
+     * @param aSaveOutput
+     * @return the process ID of the created process, or 0 if one was not created
+     */
+    long Execute( const wxString& aArgs,
                   const std::function<void(int, const wxString&, const wxString&)>& aCallback,
                   const wxExecuteEnv* aEnv = nullptr,
                   bool aSaveOutput = false );