On gcc < 8, filesystem had to be included as <experimental/filesystem>, it
was also living in the std::experimental namespace, and also required the user
to link against -lstdc++fs.
The default features are the ones Crow was installed with but can be overridden by setting 'CROW_FEATURES' before the 'find_package' call.
Signed-off-by: Luca Schlecker <luca.schlecker@hotmail.com>
Also (likely) fixed problem with streaming without keeping connection
alive
Also fixed problem with multipart hanging on request
Also updated TODO entries to indicate Writer
- disable crow debug mode by default
- expose `loglevel` method on `App` to change the logging level easily
- add a startup message that guides how to change the logging level