Update screeps-game-api to Rust 2018.

[ASalvail]

Ran cargo fix --edition and added the edition flag in Cargo.toml.

[ASalvail]

A lot could be done to get rid of the extern crate and to properly scope the macros. But when I saw the 500 errors, I decided it wasn't an emergency.

[daboross]

Sounds reasonable! I'm good with merging this without all the stuff like extern crate. Not sure if you were using cargo fix --edition-idioms or doing it manually, but if you were trying manually, cargo-fix might help? It can also be imperfect, though.

Travis seems to be complaining about one more :: instead of crate:: in the reference_wrappers! macro. I had to use --all-features flag to get the error to show up locally, so cargo-fix might not have picked it up.

[ASalvail]

Sounds reasonable! I'm good with merging this without all the stuff like extern crate. Not sure if you were using cargo fix --edition-idioms or doing it manually, but if you were trying manually, cargo-fix might help? It can also be imperfect, though.

I missed that in my cargo fix --help. I'll give it a shot!

Travis seems to be complaining about one more :: instead of crate:: in the reference_wrappers! macro. I had to use --all-features flag to get the error to show up locally, so cargo-fix might not have picked it up.

Will have a look. I saw travis' notification too late yesterday.

[daboross]

Thanks for doing this!

I have a bunch of nits, but they're mostly about import ordering. rustfmt's comment formatting also breaks some markdown stuff, but it's at least better than the last time I tried it.

LMK if this seems reasonable? I could also go through and do some of the import order fixes and PR to this branch before merging.

[daboross]

LGTM! Thanks!

[daboross]

One std:: below serde:: here, but ¯\_(ツ)_/¯