- remade file names in the app

- fixed the issue with factory_defaults being saved every time the app start
- fixed the preferences not being saved to a file when the Save button is pressed in Edit -> Preferences
- fixed and updated the Transform Tools in the Editors

appWorkerStack.py

@@ -0,0 +1,44 @@
+from PyQt5 import QtCore
+from appWorker import Worker
+import multiprocessing
+
+
+class WorkerStack(QtCore.QObject):
+
+    worker_task = QtCore.pyqtSignal(dict)               # 'worker_name', 'func', 'params'
+    thread_exception = QtCore.pyqtSignal(object)
+
+    def __init__(self, workers_number):
+        super(WorkerStack, self).__init__()
+
+        self.workers = []
+        self.threads = []
+        self.load = {}                                  # {'worker_name': tasks_count}
+
+        # Create workers crew
+        for i in range(0, workers_number):
+            worker = Worker(self, 'Slogger-' + str(i))
+            thread = QtCore.QThread()
+
+            worker.moveToThread(thread)
+            # worker.connect(thread, QtCore.SIGNAL("started()"), worker.run)
+            thread.started.connect(worker.run)
+            worker.task_completed.connect(self.on_task_completed)
+
+            thread.start(QtCore.QThread.NormalPriority)
+
+            self.workers.append(worker)
+            self.threads.append(thread)
+            self.load[worker.name] = 0
+
+    def __del__(self):
+        for thread in self.threads:
+            thread.terminate()
+
+    def add_task(self, task):
+        worker_name = min(self.load, key=self.load.get)
+        self.load[worker_name] += 1
+        self.worker_task.emit({'worker_name': worker_name, 'fcn': task['fcn'], 'params': task['params']})
+
+    def on_task_completed(self, worker_name):
+        self.load[str(worker_name)] -= 1