Migrate to Velopack

[taooceros]

Velopack (https://velopack.io/) is the successor of Cloud.Squirrel (https://github.com/clowd/Clowd.Squirrel)

Several change in this pr

1. Remove shortcut related function https://docs.velopack.io/integrating/shortcuts
2. Implement a custom restart script which doesn't depend on the updater (which should not be the use case anyway). This allows restart be called at dev environment (breaking change).
3. Create the portable data folder if the package is not inside %LocalAppData% as velopack will pack the portable version for us, which doesn't allow us to modify (easily) to insert a custom folder.
4. The post_build script is modified to add information about channel. Prerelease repo will have win-x64-prerelease channel, while the main repo will have win-x64-stable channel. https://docs.velopack.io/packaging/channels
5. It also contains an experimental github action CI, which has a faster build time and larger concurrency allowance.

Todo:

• Cleanup post_build script. Build Portable is no longer needed as that will be handled by vpk pack
• Implement the logic of switching channel (maybe can delay to future).

[VictoriousRaptor]

vpk: D:\a\Flow.Launcher\Flow.Launcher\Scripts\post_build.ps1:126
Line |
126 | vpk pack --packVersion $version --packDir $input --packId FlowLau …
| ~~~
| The term '~/.dotnet/tools/vpk.exe' is not recognized as a name of a cmdlet, function, script file, or executable
| program. Check the spelling of the name, or if a path was included, verify that the path is correct and try
| again.

Looks like something's broken but I don't have any idea.

[taooceros]

vpk: D:\a\Flow.Launcher\Flow.Launcher\Scripts\post_build.ps1:126
Line |
126 | vpk pack --packVersion $version --packDir $input --packId FlowLau …
| ~~~
| The term '~/.dotnet/tools/vpk.exe' is not recognized as a name of a cmdlet, function, script file, or executable
| program. Check the spelling of the name, or if a path was included, verify that the path is correct and try
| again.

Looks like something's broken but I don't have any idea.

Previously the vpk installation takes 30s, so I add a cache, but weird, it should at least run the install🤔

[VictoriousRaptor]

Looks like a dup of PathContains()