Updates to 81_simple_gui.py file

[GitHubDragonFly]

Short description of change

Multiple changes to GUI and functionality

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] I have read the docs/CONTRIBUTING.md document.
• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read tests/README.md.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

What is the change?

• Handling Connection, Device Discovery, Get Tags and updating tag(s) value(s) on separate threads
• Device Discovery and Get Tags are using separate instances of the PLC()
• Connection is using the GetPLCTime() function to confirm connection to the PLC
• Added option to select Micro800 PLC (tested only to pass the logic associated with it)
• Added showing pylogix version, generally to be used for troubleshooting purposes
• GUI changed with additional listboxes for connection and error messages
• GUI changed to introduce separate frames to keep controls better aligned when the window is maximized
• Introduced support for reading multiple tags as well (comma separated tags)
• Improved the handling of the right-click "Paste" feature

What does it fix/add?

Better functionality of the app, more choices and information provided to users

Test Configuration

• PLC Model
• PLC Firmware
• pylogix version 0.7.8
• python version 3.9
• OS type and version Windows 10 v2004

[TheFern2]

Thanks for the PR, in retrospect simple gui might be a bad name since it does so much more than the original 80_simple_gui. Great work! I made the few changes you suggested, and the gui doesn't hang anymore while you put the IP and slot.

I've also fixed 80_simple_gui.py to import correct tkinter based on py2 or py3.