jQuery 4.0 Compatibility

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!

Search the codebase for uses of $.isArray, $.isFunction, and $.trim, then inspect the surrounding compatibility and test entry points. Replace the removed APIs with equivalent implementations and verify the plugin works with jQuery 4.0 without remaining uses of those APIs.