Introduce Debug Mode

[Zodiac1978]

Following the last v3 introduction, I see the need to better understand what is happening in each module.

Proposal: What about adding a new setting called "Enable Debug Mode" to our options.

In each module we can check if this option is enabled and if yes, we log additional information, like this ...

• Checking comment with ID: xy
• Honeypot check enabled, exit with spam score: xy
• Country check disabled, exit without changing score
• ...

This way we could better see in the beta phase (with enabled debug mode) what is happening is where thing go wrong.

[florianbrinkmann]

I added a DebugMode class in adb250e which can be used to log things to a debug log file in wp-content if the ANTISPAM_BEE_DEBUG_MODE_ENABLED constant is set to true. I also added first loggings to the rule handling and the precheck method of the honeypot.