itlib v1.12.3

A collection of std-like single-header C++ libraries

Release notes

- New libraries:
	- `func_ptr`: similar to C++26's function ref
	- `shared_func`: wraps a function in a shared pointer
- `pod_vector`:
	- rename default allocator to `podvec_allocator` and move to itlib namespace
	- add `podvec_noinit_allocator` and typedef `pod_vector_noinit`

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