EXAMPLES
* filter on runtime values/variables (not only types)
* support to polymorphic types (see #859)

DOC:
* custom storage/view
* update entity doc when the storage based model is in place
* in-place O(1) release/destroy for non-orphaned entities, out-of-sync model
* view: single vs multi type views are no longer a thing actually
* bump entities, reserved bits on identifiers

TODO:
* work stealing job system (see #100) + mt scheduler based on const awareness for types
* combine version-mask-vs-version-bits tricks with reserved bits to allow things like enabling/disabling
* self contained entity traits to avoid explicit specializations (ie enum constants)
* auto type info data from types if present
* storage entity: fast range-push from above
* suppress -Wself-move on CI with g++13
* built-in no-pagination storage - no_pagination page size as limits::max
* any cdynamic to support const ownership construction
* meta non-const allow_cast overloads: (const int &) to (int &) is not allowed, but (const int &) to (double &) is allowed (support only for convertibles)
* review build process for testbed (i.e. tests first due to SDL)
* use unique_ptr or any for meta_custom_node
* paged vector as a standalone class
* resource: shared_from_this?
* archetype-like a-là EnTT support (see my own notes)
* organizer: view/storage only based model, no registry
* redesign snapshot as a whole
* explore "runtime" mode for hashed string where the source is copied internally
* storage: shrink_to_fit does not work with reentrant destructor?
* test trivially_destructible optimization
* finish the imgui viewer/editor!
* add basic_storage constructor which accepts a pair of iterators if possible
