Error when GoScene has scenes set to null
Bugfix
Gallery refactor

- Number of columns
- Cells checking
IconButton refactor

- Checked color
- Some renaming
getComponentById
label method
Some renamings in baseview
Fixes in tests
renamed
Minor changes
Add component action
Fixed prefHeight in MultiWidget
Removed some unused classes
Many tiny changes
Better events handling in base view
Improvements in scene gallery
Improvements in group editor
Scene selector
Minor fixes
Interactions panel