CTFF plans for next release

[Skyler84]

As was discussed there are probably a few minor things that will change before the 0.4.0 release, Please correct which ones i've added or add/remove as necessary:

• Challenge.get_flag() should be changed to take the request as an argument rather than importing Flask.request . This is to start decoupling the framework from flask for when we move away from it in a later version (to something like Startlette) and to make it clearer that the request may be used to determine the flag (from user/session data etc)
• Add more different Parts for input types and display types
• Rename the main CTFF class to CTF (we're not instantiating a framework?)