r1022 - Various Changes

• Fix for terrain2.png and terrain3.png sometimes loading as white textures.
• Can no longer crash minecraft with /cameraadd if a nonnumber is supplied.
• Glass can now take translucent textures.
• '\n' will create line breaks with the UILabel now.
• Overlays textures are now looked up as "/overlays/texture.png" instead of "overlays/texture.png" to be in line with other texture retrievals