cad/k40-whisperer: Update to 0.35

Changelog:

• http://www.scorchworks.com/K40whisperer/k40whisperer_change_log.html
• http://www.scorchworks.com/K40whisperer/k40whisperer.html

• Do not set PKGNAMEPREFIX to the Python package name prefix. The software does not care about the underlying Python version and supporting flavors is not worth it in this case.
• Mark the port as working with Python 3.7.
• Set DESKTOP_ENTRIES, USES=shebangfix, and NO_ARCH.
• Put variables in order.
• Change the way files are installed so that it is easier to spot a change in pkg-plist in the future.
• Fix Python script indentation issues (mixed up tabs and spaces) in post-patch.
• Suggest the user to look in the docs directory instead of the data directory for notes about Linux and macOS setups.