Implemented a new look for Layers Docker
This patch does at least one global change:
- Now KisNodeModel has *two* columns! The first one is purely technical and does nothing. It is only needed to reserve space for the visibility icon that is painted over it by KisNodeDelegate attached to the second column. See comments in o KisNodeModel::columnCount() o KisNodeDelegate::editorEvent() o KisNodeDelegate::drawVisibilityIconHijack()
Ref T106,M11