Bump requirements to Swift 5.4, migrate to @resultBuilder

[MaxDesiatov]

This updates the project to use Swift 5.4 across all platforms. Swift 5.4 is now also the required version, which allows us to use @resultBuilder instead of the deprecated version of this attribute from Swift 5.3.

Use carton 0.11.0 or later from now on to build with SwiftWasm 5.4.0.

[ezraberch]

We can switch back to the Swift 5.4 version of SwiftLint now. You can use mayk-it/action-swiftlint@3.2.2 for this.

[ezraberch]

Getting some new warnings:

1. warning: in tools version 5.4.0 and later, use 'executableTarget()' to declare executable targets

Can be fixed by switching to executableTarget in Package.swift for the 5 executable targets.

2. warning: assuming you mean 'Color.red'; did you mean 'Optional<Color>.red' instead?

I'm not exactly sure what's going on here. Seems to no longer be an issue with Xcode 13, so could just ignore for now.

3. 'CGTK' gtk+-3.0.pc: warning: prohibited flag(s): -Wl,-framework,Cocoa, -Wl,-framework,Carbon, -Wl,-framework,CoreGraphics
'CGDK' gdk-3.0.pc: warning: prohibited flag(s): -Wl,-framework,Cocoa, -Wl,-framework,Carbon, -Wl,-framework,CoreGraphics

Know which flags are the problem here?

4. warning: '--enable-test-discovery' option is deprecated; tests are automatically discovered on all platforms

Looks like a carton issue.

[MaxDesiatov]

Getting some new warnings:

1. warning: in tools version 5.4.0 and later, use 'executableTarget()' to declare executable targets

Can be fixed by switching to executableTarget in Package.swift for the 5 executable targets.

Done

2. warning: assuming you mean 'Color.red'; did you mean 'Optional<Color>.red' instead?

I'm not exactly sure what's going on here. Seems to no longer be an issue with Xcode 13, so could just ignore for now.

Yup, I have no idea either, doesn't look critical at the moment

3. 'CGTK' gtk+-3.0.pc: warning: prohibited flag(s): -Wl,-framework,Cocoa, -Wl,-framework,Carbon, -Wl,-framework,CoreGraphics
'CGDK' gdk-3.0.pc: warning: prohibited flag(s): -Wl,-framework,Cocoa, -Wl,-framework,Carbon, -Wl,-framework,CoreGraphics

Know which flags are the problem here?

Not sure, nothing's changed on that front in Tokamak codebase, I suspect some updates to SwiftPM in Swift 5.4 could be the culprit.

4. warning: '--enable-test-discovery' option is deprecated; tests are automatically discovered on all platforms

Looks like a carton issue.

Fixed in swiftwasm/carton#257

I assume all warnings that could be resolved in Tokamak are resolved here?

[ezraberch]

Yup, looks good.