New more Secure Auto Routing

Since the current auto routing is a security risk, the default would be changed to disabled in v4.2.0.
See https://forum.codeigniter.com/showthread...#pid395045
We don't recommend to use it.

But auto routing is a convenient feature that eliminates the need to define each route, making it easier to develop.

So I would like to introduce optional New more Secure Auto Routing:

• A controller method needs HTTP verb prefix like `getIndex()`, `postCreate()`.
  • Developers always know HTTP method, so requests by unexpected HTTP method does not happen.
    
• The Default Controller (`home` by default) and the Default Method (`index` by default) must be omitted in the URI.
  • Restrict one-to-one correspondence between controller methods and URIs.
    
  • By default, you can access `/`, but `/home` and `/home/index` are 404.
    
• It checks method parameter count.
  • If there are more parameters in the URI than the method parameters, it results in 404.
    
• It does not support `_remap()` method.
  • Restrict one-to-one correspondence between controller methods and URIs.
    
• Can't access controllers in Defined Routes.
  • Completely separates controllers accessible via Auto Routes from those accessible via Defined Routes.
    

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper