Use rectangular map sizes

[bmaupin]

Square world sizes were used because this was originally developed with the Dune Wars Arrakis map in mind, which is a square map:

quick-civ-4/src/ModPatcher.ts

Lines 186 to 187 in 82d652b

	let newGridHeight = 3;
	let newGridWidth = 3;

But all the default map sizes are all rectangular and might give better results:

0bc5de6

e.g.

• 3x3 -> 4x2?
• 4x4 -> 5x3?
• 5x5 -> 6x4?

etc.