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* in terms of `Fold` and `Map`, not the most efficient but reasonably concise
* added appropriate test cases
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* as everything this library does happens during compile time it can be checked using standard language features
** i.e. `static_assert` already offers everything needed for test cases in this situation
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* it may be useful for more than test cases
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* as its name implies this _function_ only returns elements which evaluate to _true_ when passed to a given _function_
** this marks the moment where _TypeAsValue_ supports something _ConstList_ does not, i.e. primary goal is achieved
*** namely returning different types depending on the actual _values_ of a _Cons_ structure
* added appropriate test case
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* as its name implies this _function_ applies a given _function_ to each element of a _Cons_ structure
* added appropriate test case
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* this removes the need for maintaining a partial overload of `Length`
* the recursive traversion of the _Cons_ structure is now implemented by `Fold` instead of needlessly duplicating it
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* applies a given _function_ to each _Cons_ starting with a initial value
* added appropriate test case
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* partial specializations offer control over lazy type instantiation
** `If` is currently only a `std::conditional` wrapper and requires further refinement to be really useful for this kind of use case
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* as its name implies this function _takes_ a maximum of _Count_ elements of a list
* added appropriate test case
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* as its name implies this function returns the _nth_ value of a given _Cons_ structure
* added appropriate test case
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* as its name implies this function returns the length of a given _Cons_ structure
* result type is `Size<Length>` which wraps `std::size_t` to match the `sizeof` operator
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* concatenates two given _Cons_ based lists into a single one
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* `Cons` is a straigth forward type _pair_ containing `car` and `cdr` typedefs
** they may be accessed using `Car` and `Cdr` helper template aliases
** there is no enforcement of _Cons_ structure and type equality whatsoever
*** i.e. similar to Scheme and different from how it is implemented in _ConstList_
* `List` is a recursive variadic helper template for constructing `Cons` value types
** simplifies _Cons_ construction and may be expanded to offer type deduction and built upon to enforce type equality
* added appropriate test cases
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* the result type now depends on the `decltype` of the performed operation
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