merge
User guide.
JTable properties.
Bug fixing and refactoring.
small fix
Objects on structure tree.
Object deleting on structure tree.
Simple object properties.
Poprawa literowki
Dodanie popup menu do preview
Merge branch 'kvasnyk' of https://github.com/lechoPl/GameMaker into pawel

Conflicts:
	GameMakerEditor/src/gui/gameview/LevelPreview.java