Related to b3b5e36d.

debug panel : change json_encode/decode to serialise/unserialise to prevent non-UTF characters error

fixes #997

defaults overided settings

Removed intl version check since it's very inconsistent and it seems bundled versions are always the same ones for the same PHP versions

Fixes PHP 5.5 weird placeholder replacememt in case no arguments are provided at all (https://bugs.php.net/bug.php?id=65920).

To prevent Warning "Trying to get property of non-object" in case when nothing set to params, but you try to get some key (check is there something)

ArrayHelper::getValue($this->view->params, 'abc');

cubrid pdo does not support PARAM_BOOL so we cast the value to integer
and store 0 and 1 instead

fixes #964

also fixed some inconsistency between client and server validation.