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This PR upgrades Gridsync's PyQt5 requirement to version 5.12 but also changes various build-related scripts/configs to downgrade PyQt5 to a known working/compatible version in the event that the host is running an older operating system (including, specifically, Debian 8, Ubuntu 14.04, and macOS 10.11 -- all of which are now unsupported upstream). In addition,
tox.iniand the Makefile have been cleaned up somewhat to make platform-specific builds less convoluted; users can now simply runmaketo get a working PyInstaller-generated binary using the last-supported Qt5 version for that system (instead of, specifying, e.g.,make macos-legacyfor older versions of macOS). As another convenience,make testwill now run the test suite, conditionally wrapping thetoxcall underxvfb-runon non-macOS *nix systems (rather than dealing withtox.inis fairly limiting "platform" tags to achieve the same result).