Huge test cleaning
Removed datatables-testing module and updated all impacted POMs
Mocking objects removed from the sources
Mock objects added everywhere its needed (in modules)
Cleaned all tests accordingly
Fixed issue with default/dt:default column attribute
Added a new EmptyStringProcessor allowing to process a String, even if it's blank
Fixed issue with AJAX source URL
The URL is now processed in each module and not in the AjaxSourceProcessor
Improvements for the Thymeleaf implementation
Removed deprecated usage of StandardExpressionProcessor
Fixed issue with some processor
Added support for delayed filtering
Added new filterDelay/dt:filterDelay table attributes, allowing to override the default delay (500ms)
Upgraded the ColumnFiltering addon to 1.5.4 to support the filtering delay