Custom containers

[Witek902]

• [x] UniquePtr
• [x] SharedPtr + WeakPtr
• [x] String + StringView
• [x] DynArray
• [x] StaticArray
• [x] ArrayView
• [x] StringView
• [x] String
• [x] Map
• [x] Set
• [x] HashSet
• [x] HashMap
• [x] Queue
• [ ] Stack
• [ ] LocklessStack
• [ ] FreeList
• [ ] LocklessFreeList
• [ ] Thread
• [x] Mutex
• [x] ConditionVariable

[lookeypl]

It has to be done, but IMO it mus wait for a much later on.

I'm relabelling this to low priority and assigning to "Future releases" milestone