WorldBorder and Potions

Added new method to set the startingDiameter, endDiameter and the time it will take [void setDiameter(double startDiameter, double endDiameter, long time);]
Added Splash potion option.
Changed Radius to Diameter.
Changed get/setBlockBuffer to get/setBuffer and changed the return and parameter to double as it is not measured in whole blocks.
I don't see how an extra line is useless. And for the implementation it will only add 3 lines as minecraft takes that version of start, end, time. If anything the methods that are going to make more lines than any is the size time. Minecraft like I have said takes start, end, time so setDiameter should only be setting the diameter and nothing else. Maybe renaming the setDiameter(start, end, time) should be called something like startMovingBorder?