Container shape and mutation capability predicates.

Concepts
concept	StormByte::Type::String
	Text string types that are not generic containers.

concept	StormByte::Type::Container
	Has `begin()`, `end()` and `value_type`, and is not a String.

concept	StormByte::Type::HasKeyType
	Container that publishes a nested `key_type`.

concept	StormByte::Type::HasMappedType
	Container that publishes a nested `mapped_type`.

concept	StormByte::Type::HasPushBack
	Container that accepts `push_back` of a `value_type`.

concept	StormByte::Type::HasPushFront
	Container that accepts `push_front` of a `value_type`.

concept	StormByte::Type::HasInsert
	Associative Container that accepts `insert` of a `value_type`.

concept	StormByte::Type::HasSubscript
	Container that supports `operator[]` with key/index `U`.

concept	StormByte::Type::Sized
	Container that publishes `size()` convertible to `std::size_t`.

Container shape and mutation capability predicates.

Concepts