Add destroy and extra convenience features to AllegroFlare::Bin

[MarkOates]

AllegroFlare/Bin needs:

• destroy("name")
• destroy(T of_value)
• destroy(std::vector<std::string> names)
• destroy(std::vector<T> of_values)
• preload(std::vector<std::string> filenames_also_as_identifiers)
• preload(std::vector<std::pair<std::string, std::string>> list_of_identifiers_and_filenames)