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* Update packages. * Add many more global analyses. * Catch trailing spaces and trailing newlines in all text files. Before we were only checking newly added files, but that means we missed some. * Port the trailing spaces logic to work on Windows too. * Correct all the files with trailing spaces and newlines. * Refactor some of the dev/bots logic into a utils.dart library. Notably, the "exit" and "print" shims for testing are now usable from test.dart, analyze.dart, and run_command.dart. * Add an "exitWithError" function that prints the red lines and then exits. This is the preferred way to exit from test.dart, analyze.dart, and run_command.dart. * More consistency in the output of analyze.dart. * Refactor analyze.dart to use the _allFiles file enumerating logic more widely. * Add some double-checking logic to the _allFiles logic to catch cases where changes to that logic end up catching fewer files than expected (helps prevent future false positives). * Add a check to prevent new binary files from being added to the repository. Grandfather in the binaries that we've already added. * Update all the dependencies (needed because we now import crypto in dev/bots/analyze.dart).
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