LevelCelView: Changing height of tiles should be foolproof

[tetektoza]

Currently in LevelCelView, if we load level tiles to the GUI, we can set height of a tile, but if user feeds the line edit with any random number - it will take it, potentially freezing the app and making user to lose the progress.

My idea was to clip the value if it exceeds certain limit of height, for example 1000.

Talking specifically about this functionality:

[AJenbo]

11 would cover the screen height so probably just cap it at 10, or there a bout. Roughly 112 would cover the entire height of the level. I'm not even sure the engine will honor values over 8