Revert "refactor(jqLite): performance improvement to JQLiteAddClass/JQLiteRemoveClass/JQLiteHasClass by using element.classList property (where available). Improved original code through simple, pre-compiled RegExp. Improved code for minification by replacing commonly used strings with variables."

This reverts commit 0f0031f1c4669f67d7d2175bf112c62ed633ff20.