Revert "Fix multi layer movement in tilemap mode (fix aseprite#3144)" This reverts commit bc050e8.

Merge branch 'main' into beta 

Fix multi layer movement in tilemap mode (fix aseprite#3144) Before this fix, a multi-layer mask move (with mixed layer types: normal layer and tilemap layers with different grids) caused loss of drawing areas. The heart of this solution is to correctly align the 'selection mask' and 'transform data' according to the layer's grid, and also, forcing 'site' TilemapMode/TilesetMode before each reproduceAllTransformationsWithInnerCmds() iteration. The scale transformation could have some things to improve in later commits. Not fully tested yet.

Fix crash when showing the palette popup (fix aseprite#3189) 

Fix forward declaration of os::Sampling 

Merge branch 'main' into beta 

Fix "Reset Scale" notification when there is enough workarea available Instead of using the window size, we can use the available workarea to know that the user can resize the main window to its full size and there will be enough room to display some common dialogs like the Preferences one.

Show selected index correctly in PaletteViews used from ColorPopups (… …regression introduced in d164458)

Merge branch 'main' into beta 

Fix crash using Shift key in Pencil tool Bug introduced in f3fd0de