Handle JSON POSTs in CSRF
Handle JSON POSTs in CSRF

Important change to handle JSON POSTS in CSRF.
I wanted to send JSONS instead on normal POST but CSRF filter did not allow me to to this even if token existed in my JSON.
```
{"usr_id":1322189,"ctn":"3a111012714a58b53260ede89380d412","token":"ctn","parent":17031,"mode":{"main":"test","additional":"exam"},"time":{"start":1568992305,"end":1568993826},"result":{"2103":["T"]}}
```
my token name is: ctn

I think this is important, without this we are limiting a lot.
ytetsuro/CodeIgniter4,bcit-ci/CodeIgniter4,ytetsuro/CodeIgniter4,bcit-ci/CodeIgniter4,lonnieezell/CodeIgniter4,natanfelles/CodeIgniter4,jim-parry/CodeIgniter4,natanfelles/CodeIgniter4,bcit-ci/CodeIgniter4,butane/CodeIgniter4,bcit-ci/CodeIgniter4,ytetsuro/CodeIgniter4,natanfelles/CodeIgniter4,ytetsuro/CodeIgniter4,kenjis/CodeIgniter4,gustavojm/CodeIgniter4,jim-parry/CodeIgniter4,butane/CodeIgniter4,lonnieezell/CodeIgniter4,jim-parry/CodeIgniter4,gustavojm/CodeIgniter4,kenjis/CodeIgniter4,natanfelles/CodeIgniter4,jim-parry/CodeIgniter4,samsonasik/CodeIgniter4,kenjis/CodeIgniter4,butane/CodeIgniter4,jim-parry/CodeIgniter4,gustavojm/CodeIgniter4,butane/CodeIgniter4,ytetsuro/CodeIgniter4,samsonasik/CodeIgniter4,butane/CodeIgniter4,butane/CodeIgniter4,lonnieezell/CodeIgniter4,samsonasik/CodeIgniter4,lonnieezell/CodeIgniter4,ytetsuro/CodeIgniter4,lonnieezell/CodeIgniter4,natanfelles/CodeIgniter4,natanfelles/CodeIgniter4,kenjis/CodeIgniter4,gustavojm/CodeIgniter4,kenjis/CodeIgniter4,samsonasik/CodeIgniter4,bcit-ci/CodeIgniter4,jim-parry/CodeIgniter4,samsonasik/CodeIgniter4,lonnieezell/CodeIgniter4,samsonasik/CodeIgniter4