Rename the loader class

[vonalbert]

I see the Loader Class does not actually load a file, but it just locates non-class files. Hence I propose rename it to FileLocator and move it under the CodeIgniter\Autoloader namespace.

If you're ok with it I can take the burden :)

[lonnieezell]

That sounds good. Originally, I thought there was going to end up being more in there, but it looks like we might not need more than that, so this rename makes sense.

[vonalbert]

Ok, I'll make a PR as soon I can. Want me to move it also under the Autoloader namespace or it can stay where it is?

[lonnieezell]

Moving to autoloader namespace sounds good.

[vonalbert]

👍