.hide
														.hide-force
														 
														.show-hover-*
														 
														
														Old Boostrap
														.hidden-*-[up|down]
														 
														Boostrap classes
														.visible
														.invisible
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															.hide using just display: none;   
															.hide-force using display: none !important;   
														 
														
															.show-hover-* used to show hidden elements on mouse over. 
															Note: desktop only! Always visible on mobile devices!
  
															Visible on mobile 
															.show-hover-container (main container) 
															.show-hover-item (item to be hidden by default; visible on hover)
  
															All devices, same behaviour 
															.show-hover-container-all (main container) 
															.show-hover-item-all (item to be hidden by default; visible on hover)
														 
														
															.hidden-*-[up|down] are the classes removed in Bootstrap 4. 
															For some people is more handy to use them than combinations of .d-block .d-none new bootstrap classes. 
															So you can use .hidden-md-down, .hidden-xs-up, etc. Smarty layouts are not using them by default!.
															
  
															If you don't want them, you can comment/remove them in your production: _core/utils/_visibility_oldbs.scss
														 
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