Mirror v0.56 Release and a few macOS fixes

I got a bit behind on releases, but here is the latest.

The macOS Build changes

• Now using Python 3.9.1. Python is built in to the binary so you don't need to install it yourself.
• Able to remove most of the macOS specific tweaks. The only remaining one is to set the default font to the macOS System Font.
• Added pyinstaller to the requirements.txt as it was supposed to be (bug).

From Scorch's changelog:

Changes in Version 0.54:

- Reverted back to egv.py file from Version 0.52 fixing problem with movements introduced in Version 0.53

Changes in Version 0.55:

- Fixed multi-machine operation under Windows 10 
- Fixed an occurrence of "float argument must be a string or a number" error for some SVG files.

Changes in Version 0.56:

- Added code to fix driver conflict new drivers added to Linux 
- Changed default file type to svg/dxf