jQuery 4.0 Compatibility

[odivit]

There are several compatibility issues in jQuery-QueryBuilder after upgrading to jQuery 4.0. Specifically, the following APIs have been removed:

$.isArray
$.isFunction
$.trim

Suggested replacements:

$.isArray = Array.isArray;
$.isFunction = (v) => typeof v === 'function';
$.trim = (v) => v == null ? '' : String.prototype.trim.call(v);

Please update the codebase to use these (or equivalent) replacements so that jQuery-QueryBuilder is fully compatible with jQuery 4.0.

Thank you!