WPSC_Logging Class

This is functional, but there are things that needs to be in order:

1. Adding Log entries should be done only if permitted by the user (Enable Logging). Otherwise the Log can get randomly (and really) big.

2. Pruning. It's not currently enabled but should be. This can be a sub-task of 1 too, since it'll depend on the Logging settings (if we are going to add a UI one to WPEC).