Fix: Move application integration tests to app crate so they actually run

[actioninja]

I'm submitting a

• bug fix
• feature
• documentation addition

What is the current behaviour?

Integration tests don't run

What is the expected behavior?

Integration tests should run

Turns out that the dev dependency removal in #324 was slightly erroneous. Integration tests weren't in the proper directory so were never actually running or picked up as integration tests. This made cargo-udeps give a false positive for them.

This wasn't that big of a deal, considering the one integration test intended to test whether help printed but never actually did that.

Also moves utils.rs to a folder module, since they aren't picked up by the integration test scanner. the run command was changed to not strip out the initial "comtrya" since I found this a confusing behavior until I checked the implementation.

[martintc]

LGTM. Everything seems to build fine, I see more tests popping up when I run. Good catch! I'll give it a day or two for the other maintainers to pipe in if they get a chance. Otherwise, I'll merge it pending they don't pull the brakes on something.