OpenHaze v0.3.0

OpenHaze now tells you when a new version is out, and upgrading on Windows no longer stops on a running copy.

• Update notices on both platforms. Once a day the app asks GitHub for the latest release. A newer one appears at the top of the menu bar or tray menu and is announced once, with a balloon on Windows and an alert on macOS, and either one opens the release page. Nothing is downloaded or installed automatically. "Check for updates" in the menu checks right away, and the daily check can be turned off in Settings.
• The Windows installer closes a running OpenHaze by itself. Setup used to list it as a blank entry, fail to close it, and then stop with "DeleteFile failed; code 5". OpenHaze now has a proper name in Windows, exits cleanly when an installer or a logoff asks it to, and Setup ends it as a last resort. The "Do not close the applications" option is gone, because it could only end in that error.
• The macOS app passes strict signature checks again. 0.2.2 hid the .app extension in the disk image, which stores Finder data on the app that codesign --verify --strict rejects. The extension is visible again, and packaging now runs the strict check itself.
• Releases now include SHA256SUMS.txt for checking the downloads.

What's Changed

• Let the installer close a running OpenHaze by @jay739 in #13
• Keep the packaged app passing strict signature checks by @jay739 in #14
• Tell users when a new release is out by @jay739 in #15
• Add a changelog, a backlog, and checksums to releases by @jay739 in #16

Full Changelog: v0.2.2...v0.3.0