Table.layout fixed.and.sticked.overhaul.2

[BertrandPodevin]

Description

Fixes (non breaking) :

• Fix table sticky colums & header drop shadow on scroll not working. (Drop shadow are currently always visible, they should only be visible on scroll)
• Simplified DOM : mod-columnSticky-shadowMask class no longer needed

Overhaul :

• New system using css vars instead of class for the inner settings, drasticaly reducing dist size

tableFixedLegacy : 37 Ko --> tableFixed : 2 Ko tableStickedLegacy : 52 Ko --> tableSticked : 8 Ko

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