Remove executable products and rename executable targets to kebab-case (fixes #21)

[stackotter]

This is my solution to #21 as described in the issue.

[stackotter]

Ok hopefully that should be working now, I've updated all of the scripts to operate on targets instead of products now.

Btw these integration-tests are sick! I was prepared for mundane test case output, but no! I need to get onto this for my image formats library 😅.

[tayloraswift]

haha thanks! unfortunately it looks like utils-test is broken

[stackotter]

Doesn't look like the macOS issue is due to anything that I've changed (I've had similar things in my workflows in the past), but that Linux issue is definitely due to my changes. Seems like SwiftPM doesn't build executable targets all the way to an executable on linux (it stops once it produces a .o file).

On Linux swift build -c debug --product unit-test does what swift build -c debug --target unit-test does on macOS, even without any explicit unit-test product (probably due to a generated product). So swift build -c debug --target unit-test is the way to go on macOS and swift build -c debug --product unit-test is the way to go on Linux...

I think the best solution would be to update the shell scripts to use swift run instead of splitting each set of tests into a building phase and a running phase. swift run unit-test works as you'd expect on both macOS and Linux (I haven't tested it on Windows). Would you be ok with that as a solution?

[tayloraswift]

sounds good to me!

[stackotter]

Hopefully that should work now 🤞