[Windows] GUI Portable executable (CPU only)

A stand-alone executable for Windows 10. Pyinstaller used to freeze the python libraries.
Tested on 64 bit windows. Download a pretrained model separately to start playing with voices.

Changelog:

Updated UI to make file browsing less confusing
Added ability to limit CPU usage during synthesis.
Added StreamElement options: Play donor's name and amount; Approved donations only.
Enabled console in Pyinstaller build

Known issues:

Stream Elements options: big numbers not implemented