Release 26.2

• switched from PySimpleGui to FreeSimpleGui (issue #115)
• fixed utf-8 import (issue #114)
• fixed MAXBEST bug (issue #113)
• changed startup to: python -m src.tbui
• support of python 3.11, 3.12, 3.13
• desupport of python 3.10 or oldder
• desupport of windows executable
• added unit tests