Storage API

This is an implementation of the Storage API, a better version of the Allocator API, and data structures made for them including

• Box
• Vec
• String

How is it better than Allocator?

Storages have an associated Handle type so allocations dont need to be represented by a pointer, which allows Storages to allocate from a buffer they store inline

Instead of having Vec and ArrayVec as 2 seperate data structures they can be merged together, only using different Storages