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.

Total 0 items. when list is empty.
and showing x out of x for n>0 and paging on.

When we do not want an attribute to be searched we do not define it in
the filter model, or mark it inctive in the scenario when we use the
original model.
GridView should not try to access the attribute then and automatically
not display the filter field.

consistent api for safe and required

fixes #929

when error occurs while handling errors output was not readable in web
context

fixes #964

fixes #963

fixes #961

adjust depended asset position or throw exception on conflict