Updates to enhance GitHub Actions continuous integration:
* ci: add macOS app bundle packaging using cargo-bundle, closes#352
based on https://github.com/EndlessSkyCommunity/ESLauncher2/blob/master/Cargo.toml
* ci: add web target, building using wasm-pack (for #446)
* ci: refactor and cleanup targets, split out instead of using matrix
* main: save config in consistent OS-specific dirs::config_dir()
Instead of storing and loading in the current working directory, change
to a consistent dedicated configuration directory. This is necessary for
.app launching since cwd is set to /. To preserve compatibility with
existing installations, if conf.cfg exists in cwd then it will be used instead,
but otherwise we will use the operating system specific config dirs:
// Lin: Some(/home/alice/.config)
// Win: Some(C:\Users\Alice\AppData\Roaming)
// Mac: Some(/Users/Alice/Library/Application Support)
* macos: add icons based on screenshotted logo
* macos: add Cmd-Q to quit
Consolidates the multitude of CI systems, replacing Azure, SourceHut, and
AppVeyor with GitHub Actions, which now also runs clippy and fmt. See #352
* Add task to run clippy
* Add task to check formatting
* Test on 1.44.1 toolchain
* Update readme: status badge and downloads on GitHub Actions
* Remove strip binary task, leave it unstripped to allow debugging for now
* Rename task to install dependencies
* Remove Azure Pipelines
* Remove sr.ht SourceHut CI
* Remove AppVeyor
* Add first action
* Install libxcb-composite0-dev, fix job name
* Use apt-get instead of apt, more descriptive names for os-specific steps
* Also match .exe, thanks windows
* use upload-artifact v2
* Specifically pick out the binary for upload
* Fix step name
* Name binary after target os
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