[EDITOR] [SUGGESTION] [ADDED] Prevent attempt to go below minimum level size

[Wafflem]

Status: Added.

[Wafflem]

A very minor suggestion, but if one attempts to set the level size to below 320 or below 160 (the minimum size of a level), the editor should not shrink the level size to that, and instead should give them an error saying the size cannot go below 320 and/or 160.

[namida]

Huh, I honestly thought this had already been implemented. Oh well, I'll be sure to do this next time I'm working on the editor.