Adding optional support for trailing slash clean in PATH

[rippak]

Moved one old project to F3 where trailing slashes in routes are obligatory

[Rayne]

When this gets accepted, make all indentations consistent and don't forget to update the documentation. :-)

[rippak]

Thanks, I'll check it. Phpstorm shows normal indents.
Where should I update the docs?

[Rayne]

The docs are here, but I would wait until this change got accepted.

[rippak]

Of course, just asking

[ikkez]

Would you mind if we rename the option var to something like... REROUTE_TRAILING_SLASH maybe? 🤔
I'm wondering if there's more to do here. Like generating links to aliases? Switching to trailing slashes and also reroute non-trailing slash urls to those with slash, when the new option is on. Having both options enabled might lead to duplicate content warning .. just keep that in mind.

[rippak]

Naming is not a problem at all.

[ikkez]

Renamed to REROUTE_TRAILING_SLASH and committed.