Add better checking for animatable elements.
Remove hd support checkbox

Add automatic HD support.
Add skin size display.
Remove header from description

Add htmlpurifier and markdown parser to dependencies.
Added parsing of user skin description and fixed laravel upgrade issue.
Add download count to skin informations
Better check for overriden element.
Add attribiutes for overriden/auto generated elements.
Add handling for groups, MAAAAAAANY changes.
Change groups tables - add basic structure for further progress on checking completion.
Properly distinguish between animations and fix for wrong sequence frame number
Sort additionally by sequence frame.
Add handling of element being added to group.
Add missing element detection.