0.6 Beta update

Version 0.6 Beta changes:

Game:

- Fix: Disappear text "OK" on start level window.

- Fix: Closing fail level window and after back to menu, menu's UI was hide.

Level editor:

- Add: Button to back from test level to edit level.

- Fix: Wrong laser beam direction after place.

- Fix: Infromation about no Dweep or baby Dweeps after back from test level.

- Fix: No laser beams on test level.

- Fix: Place object previous can be moved from level editor to lest level.

- Fix: Load custom levels in editor or level selector window.

- Fix: Closing load custom level window disable input.

- Fix: Swap only one objects on map.