Raspberry Pi OS Bullseye support

[druck13]

Raspberry Pi OS Bullseye no longer includes Python 2, so all python programs containing #!/usr/bin/env python will no longer run directly from the command line unless it is changed to #!/usr/bin/env python3.

I have not removed Python 2 support or changed the documentation, the programs can still all be run under Python 2 on older OS's by prefixing the command with python, but will run by default under Python 3.

It probably is time to remove Python 2 support completely, but I'll leave that to the author.

[coveralls]

Pull Request Test Coverage Report for Build 2565422218

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 74.026%

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Totals
Change from base Build 1820718973:	0.0%
Covered Lines:	57
Relevant Lines:	77

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💛 - Coveralls

[Gadgetoid]

I am leap-frogging this to the whole mess of Pi 5 and Bookworm. Thank you, however, for making this PR and sorry for the lack of attention here- I have been worlds away in Pico land :grimacing: