- 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

appWorker.py

@@ -0,0 +1,69 @@
+# ########################################################## ##
+# FlatCAM: 2D Post-processing for Manufacturing            #
+# http://flatcam.org                                       #
+# Author: Juan Pablo Caram (c)                             #
+# Date: 2/5/2014                                           #
+# MIT Licence                                              #
+# ########################################################## ##
+
+from PyQt5 import QtCore
+import traceback
+
+
+class Worker(QtCore.QObject):
+    """
+    Implements a queue of tasks to be carried out in order
+    in a single independent thread.
+    """
+
+    # avoid multiple tests  for debug availability
+    pydevd_failed = False
+    task_completed = QtCore.pyqtSignal(str)
+
+    def __init__(self, app, name=None):
+        super(Worker, self).__init__()
+        self.app = app
+        self.name = name
+
+    def allow_debug(self):
+        """
+         allow debuging/breakpoints in this threads
+         should work from PyCharm and PyDev
+        :return:
+        """
+
+        if not self.pydevd_failed:
+            try:
+                import pydevd
+                pydevd.settrace(suspend=False, trace_only_current_thread=True)
+            except ImportError:
+                self.pydevd_failed = True
+
+    def run(self):
+
+        # self.app.log.debug("Worker Started!")
+
+        self.allow_debug()
+
+        # Tasks are queued in the event listener.
+        self.app.worker_task.connect(self.do_worker_task)
+
+    def do_worker_task(self, task):
+
+        # self.app.log.debug("Running task: %s" % str(task))
+
+        self.allow_debug()
+
+        if ('worker_name' in task and task['worker_name'] == self.name) or \
+                ('worker_name' not in task and self.name is None):
+
+            try:
+                task['fcn'](*task['params'])
+            except Exception as e:
+                self.app.thread_exception.emit(e)
+                print(traceback.format_exc())
+                # raise e
+            finally:
+                self.task_completed.emit(self.name)
+
+        # self.app.log.debug("Task ignored.")