- more changes in strings throughout the app

- made some minor changes in the GUI of the FlatCAM Tools
- in Tools Database made sure that each new tool added has a unique name
- in AppTool made some methods to be class methods

AppTools/ToolCalibration.py

@@ -64,7 +64,7 @@ class ToolCalibration(AppTool):
         grid_lay.setColumnStretch(1, 1)
         grid_lay.setColumnStretch(2, 0)
 
-        self.gcode_title_label = QtWidgets.QLabel('<b>%s</b>' % _('GCode Parameters'))
+        self.gcode_title_label = QtWidgets.QLabel('<b>%s:</b>' % _('Parameters'))
         self.gcode_title_label.setToolTip(
             _("Parameters used when creating the GCode in this tool.")
         )