Game map dimensions should be enumerated or represent units of 25

[mickeelm]

Given the decision that a map dimension only can be a multiple of 25, this should be more obviously reflected in the client code. E.g. instead of integer-input, enumerate like for example:

small(25) medium(50) large(75) x-large(100)

If we don't want to limit ourselves like this (e.g. it should be possible to have a 475x650 board) another option is to work with size units (integers). 1x1 would be like 25x25 works now, 4x4 would make it 100x100, 2x5 is 50x125 etc...

[blackenedsystems]

For clarity ... the world doesn't need to be a square, we can combine sizes so that the world is SMALLxMEDIUM, etc