Start rebuilding linked list

Fix linked list index access

Implement pop method for aut resizing array

Implement access at index for linked list

Test insertion at zero and end

Add prepare_for_len_increase method

Implement insert for FVec

Implement a singly linked list

Remove unnecessary type declaration in ptr read

Bump to current nightly allocation API

Test vector items after reallocation

Add access by index and several basic tests

Implement initial allocation on first push

Implement resizing and reallocating resized vector

Move resizing vector exercise to its own folder