Add easy "debug mode" switch for php override rules to CP UI

[Xunnamius]

php_admin_value error_reporting -1
php_admin_value error_log "/home/X.com/logs/X.com.php.error_log"
php_admin_value display_errors "on"
php_admin_value display_startup_errors "on"
php_admin_value log_errors "on"

Note sure about that error_log line, might be contingent on a different value for log_errors.

Nginx should also be updated:

fastcgi_intercept_errors off;
proxy_intercept_errors off;

Proper values are "off" for debugging (or if you trust applications to generate their own decent error pages) and "on" for production (i.e. all errors hidden).

[Xunnamius]

Maybe a whole debug view where switches can be toggled so that the system spits out debug information about CP itself and what it's doing/trying to do (like when creating a site), for OLS (especially rewrites), etc.