v1.1.0 Callable Concept

Ads these 3 concepts:

• Callable<T>: Anything that looks like a function. https://en.cppreference.com/w/cpp/named_req/Callable.html - Useful when you want to constrain a function argument to anything function with any amount of arguments of any type.
• CallableOfArity<T, unsigned>: Callable & the function takes an exact amount of parameters.
• CallableOfAtLeastArity<T, unsigned>: Callable & the function takes at least the given amount of parameters.

v1.0.0 Initial Release

Functionality allows for dissection of any kind of functions to get at the parameter types, number of parameters etc for more refined concepts and meta programming uses.