Added support for catching functions that will be deprecated once php7 updates

[alexiskulash]

Functions include ereg, eregi, ereg_replace, and split

[alexiskulash]

cc @sboisvert

[westonruter]

Are these deprecated functions restricted by VIP?

[sboisvert]

Yup we just finished removing them from all the repos. I'll add it to the documentation early next week.

[jrfnl]

This PR raises two questions for me:

1. Should cross-PHP version compatibility issues be a concern which should be addressed by WPCS ?
2. And if so, wouldn't it make more sense to incorporate the far more comprehensive PHP Compatibility sniffs rather than reinvent the wheel ?

[sboisvert]

1. Should cross-PHP version compatibility issues be a concern which should be addressed by WPCS ?

I can't speak for the project as a whole but VIP is moving to requiring PHP7 compatibility, these functions are the ones we've seen used multiple times so it was a sort of quick win.

1. And if so, wouldn't it make more sense to incorporate the far more comprehensive PHP Compatibility sniffs rather than reinvent the wheel ?

If the project's answer to 1 is yes then I would agree with 2.