Allows to extract a sub-array out of an array
Getting a sub array:
```rust use sub_array::SubArray;
let arr: [u8; 7] = [1, 2, 3, 4, 5, 6, 7];
// Get a sub-array starting at offset 1 let sub: &[u8; 3] = arr.subarrayref(1); assert_eq!(sub, &[2, 3, 4]); ```
Initializing an [u8;10] array with (u16, u32, u32):
```rust use sub_array::SubArray;
let foo: u16 = 42; let bar: u32 = 0x1234; let baz: u32 = 0x5678;
let mut arr = [0u8; 10]; *arr.subarraymut::<2>(0) = foo.tobebytes(); *arr.subarraymut::<4>(2) = bar.tobebytes(); *arr.subarraymut::<4>(6) = baz.tobe_bytes();
assert_eq!( arr, [ 0, 42, // foo 0x0, 0x0, 0x12, 0x34, // bar 0x0, 0x0, 0x56, 0x78, // baz ] ); ```
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