Use "common_files" config + add "ignore_files" config

[mingaldrichgan]

• zmake.json already has a "common_files" config, but it has not been used. Instead, project_build.py has a hardcoded list of common files: ["README.txt", "LICENSE.txt", "README", "LICENSE", "secondary-widget"] that is used in the common_files handler. This PR moves the hardcoded list into the "common_files" config and uses the latter in the common_files handler.
  • Note: This is a breaking change for anyone using an existing zmake.json since the previous default was "common_files": []. Feel free to suggest better ways to handle this for backwards compatibility.
• The package and make_zeus_pkg handlers already exclude .DS_Store and Thumbs.db, but the resulting packages do include .gitignore and potentially other files that should be ignored, like source maps (if uglifyjs is called with --source-map). This PR adds a "ignore_files" config to zmake.json and uses it in the package and make_zeus_pkg handlers.
  • Notes:
  • For backwards compatibility with existing zmake.json files, "ignore_files" defaults to [".DS_Store", "Thumbs.db"] if not present in zmake.json.
    • However, the default entry added to zmake.json also includes ".gitignore" since I cannot think of any reason for that to exist in the built package. - The existing substring logic (if ".DS_Store" in fn or "Thumbs.db" in fn) is kept, just using the "ignore_files" config instead. Wildcards are not currently supported.

[mingaldrichgan]

@melianmiko Is "secondary_widget" intended to be listed as a common file, or was that just for testing purposes?

[melianmiko]

@melianmiko Is "secondary_widget" intended to be listed as a common file, or was that just for testing purposes?

I added them in an experiment, and forgot to delete.