v2.04 - improved list support

• improved the support for lists: You can now write in the config with any list like type you want.
  Getting the output in a specific list like type is currently not possible. You can use the get_raw_list() method to get the unparsed value as string and then 'convert' it into a datatype you want.
• renamed functions: get_list() to get_list_as_vector()
• added the function: get_raw_list()
• added the function: write_list() which accepts any kind of list like type
• the private function vector_to_string() now accepts any kind of list like type

v2.03 - list support added - C++17

• added basic support for vectors/lists
• added functions: write_list(), get_list(), get_raw_list()
• removed overloaded function remove()
• C++17 support and above

v2.02 - now in english

• now completely available in english
• added the file_valid() function
• changed some return types to std::optional
• defined some function as [[nodiscard]]
• changed nearly all names of variables, methods etc.

SmallConfig 2.01-unstable

Die Funktionen 'exists' sind nun public, nicht mehr private.

SmallConfigs 2.0-unstable

Eine grundlegend bessere Version des Vorgängers. Deutlich effizienter, schöner und mit mehr Funktionen.
Die Version kann trotzdem noch Bugs und Fehler enthalten!