🚀 🔥 Timeline Vec to HashMap, change primitives

The timeline original Vec got swapped out for a HashMap. I might go back
and change it back to a pair of `Vec`s. The performance boost from this
will be minimal, but for bigger games it might make a change.

The timeline coordinate, which was originally a f32, is now a i32.
Again, no crazy performance boost out of this, but still one
nonetheless.

The parsing of games is now done using serde and serde_json. This means
less verbosity in the errors, though.

width, height, x and y got swapped out for a u8; this is the reason as
to why almost every file got changed.

Author: adri326

Cargo.lock

@@ -18,3 +18,5 @@ permute = "0.1.0"
 scoped_threadpool = "0.1.9"
 env_logger = "0.7.1"
 log = "0.4.11"
+serde = {version = "1.0.117", features = ["derive"]}
+serde_json = "1.0"