Release 1.38.3

* Admin Tools functionality moved from premium features to core.
* Fixed Yes/No values for checkbox type inputs.
* Fixed the issue related to huge settings data ( when there are more
than ~150 property attributes ) on settings saving ( max_input_vars ).
* Fixed save_property action.
* Fixed address validation.
* Fixed property overview search by wpp_agents and added ability to add
custom strict search using filter 'wpp::required_strict_search'.
* Fixed meta fields labels on single property page.
* Fixed different issues related to XML Importer premium feature.
* Fixed data reset on adding new form for Front End Property Submissions
(FEPS) premium feature.
* Cleaned up php and javascript code.