Minor cast fix
AddScene Improvements: javadoc & code structure
Improvements in preferences' javadoc
Improvements in ChangeInitialScene: javadoc and input validation
Improvements in NewGame: input validation
Improvements in CompositeCommand javadoc
Minor fix in SidesLayout
Minor refactor in BaseGallery (@rotarudan and @gorco be aware of this): galleryTable => galleryGrid
Desktop platform: moving the construction of JavaRequestHelper to the DesktopPlatform constructor
Code legibility improvements in the view: mainBuilder and ScenesList

Javadoc + removal of anonymous classes
Fixes #111 and perhaps #179 (needs to be checked)
Formatting