Frederik Kvartborg Albertsen

Add a `type Vec2[T Number] [2]T` and `type Vec3[T Number] [3]T`

Should be used to verify if the use of other numerical types can benefit performance.

Use benchstat to analyse benchmarks automatically

2

### time per operation ``` operation / dimension gonum time/op vector time/op delta vector addition / 1 153ns ± 1% 18ns ± 5% -88.11% (p=0.029 n=4+4) vector addition / 2...