Clear modX::user on init context

Possible fix for http://bugs.modx.com/issues/10221
fix boolean and numeric values for rendering

empty($params['key']) does not work for string "false"
Reg exp bug
Added ability to define "welcome" action & namespace
Better be handled at the controller level (modManagerRequest)
Stick with class parameters...
Removed hard coded "welcome" action
First step on cleaning up smarty usage
Make sure we have an element to use the loading mask (FormPanel)
Context templates (smarty)
Workspace templates (smarty)
Media source templates (smarty)
Search templates (smarty)
Logs templates (smarty)
Resource schedule templates (smarty)
Resource data templates (smarty) + prevent error trying to get resource pagetitle when no resource is found
System info templates (smarty)
Dashboards & widgets templates (smarty)
Remove unused assets/template for access policies
Access policies/template templates (Smarty)