Remove Python 3.7 support

[thomas-bc]

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Change Description

Sunsetting Python 3.7 support

Rationale

Python 3.7 came to end of life: https://endoflife.date/python
Support has been dropped on https://github.com/nasa/fprime

[thomas-bc]

Do we want this change?
This may cause confusion for users, as pip install fprime-tools will install older versions without warning if running Python 3.7. But I don't think there is a better solution. The alternative is to keep it in, which may cause errors when running pip install.

[LeStarch]

When we break the bootstrapping script into its own entity that can support multiple versions of python and users of (deprecated) 3.7 could then install older versions of F´  with supported packages.