Programmatic games by storing information as data

[Douile]

This PR adds the ability to store a game as a Game struct which has all the information we need to make a request for that game: default port, protocol (and protocol settings). It also has extra metadata.

In order to use the game structs with a common function a common return type had to be defined, here I chose to create a struct them implement from on other structs to convert them into the generic type. This has the benefit of not having to pass pointers around like if I had used traits but the downside of cloning the response as I chose to include the original response type within the generic response.

This draft only includes one game for each protocol for testing purposes, if everyone is happy I will go ahead and add the rest.

This would replace #42 however we could potentially use a similar build script to generate the game data structures e.g. from node-gamedig/games.txt

EDIT: in theory this could also replace the individual query functions for each specific game however it might be nice to keep them as they provide a way to easily get the specific response types.

EDIT: closes #36

[CosminPerRam]

... but the downside of cloning the response as I chose to include the original response type within the generic response.

Had a quick thought of making yet another struct for each protocol, something like a "NonGenericValveResponse" that would be the original struct, but without the fields that GenericResponse uses, this would eliminate the need of cloning but I'm not sure if it is worth doing.

[Douile]

I like this idea, didn't think of that.

[Douile]

I created a table of all the response types: https://github.com/Douile/rust-gamedig/blob/dev-programmatic-games-2/RESPONSES.md

[Douile]

The only real remaining problem I see is generating the list of game definitions: I'm not sure I want to write all 52 manually.

The other stuff still to be done:

• [x] Add generic response types for TheShip and FFOW?
• [x] Include player data in extra responses
• [x] Improve doc comments
• [x] Format code with cargo fmt (didn't do this because changes lots of stuff I didn't touch)
• [ ] Check placement of types is in "correct" namespaces

[Douile]

Let me know if you want me to rebase this to make commits neater, if you're just going to squash its fine.

[CosminPerRam]

I'll squash it.

[CosminPerRam]

Formatting seems to fail, could you look into it to make it pass? In rest, great job on managing the generic query and programmatic games, thank you a lot. I do have some ideas to expand on it and/or to make it more maintainable, but firstly, let's merge this!

[Douile]

Thank you. Nice, I'm planning on making another PR to add a way to generically access a list of players via a method implementation on the GenericResponse object after this is merged so let me know what changes are planned.