cleanups

implement TclCommand.TclCommandSignaled as proof of concept (not usefull)
bypass using threads  within obj.generatecncjob(use_thread = False, **args)
reimplement some more shell commands  to  OOP style

tclCommands/__init__.py

@@ -1,5 +1,4 @@
 import pkgutil
-import inspect
 import sys
 
 # allowed command modules
@@ -7,9 +6,10 @@ import tclCommands.TclCommandExteriors
 import tclCommands.TclCommandInteriors
 import tclCommands.TclCommandAddPolygon
 import tclCommands.TclCommandAddPolyline
+import tclCommands.TclCommandExportGcode
+import tclCommands.TclCommandCncjob
 
-
-__all__=[]
+__all__ = []
 
 for loader, name, is_pkg in pkgutil.walk_packages(__path__):
     module = loader.find_module(name).load_module(name)
@@ -25,8 +25,8 @@ def register_all_commands(app, commands):
 
     we need import all  modules  in top section:
     import tclCommands.TclCommandExteriors
-    at this stage we can include only wanted  commands  with this, autoloading may be implemented in future
-    I have no enought knowledge about python's anatomy. Would be nice to include all classes which are descendant etc.
+    at this stage we can include only wanted  commands  with this, auto loading may be implemented in future
+    I have no enough knowledge about python's anatomy. Would be nice to include all classes which are descendant etc.
 
     :param app: FlatCAMApp
     :param commands: array of commands  which should be modified
@@ -35,14 +35,14 @@ def register_all_commands(app, commands):
 
     tcl_modules = {k: v for k, v in sys.modules.items() if k.startswith('tclCommands.TclCommand')}
 
-    for key, module in tcl_modules.items():
+    for key, mod in tcl_modules.items():
         if key != 'tclCommands.TclCommand':
-            classname = key.split('.')[1]
-            class_ = getattr(module, classname)
-            commandInstance=class_(app)
+            class_name = key.split('.')[1]
+            class_type = getattr(mod, class_name)
+            command_instance = class_type(app)
 
-            for alias in commandInstance.aliases:
-                commands[alias]={
-                    'fcn': commandInstance.execute_wrapper,
-                    'help': commandInstance.get_decorated_help()
-                }
+            for alias in command_instance.aliases:
+                commands[alias] = {
+                    'fcn': command_instance.execute_wrapper,
+                    'help': command_instance.get_decorated_help()
+                }