Move the randomPlayerLocations rmgen2/ function to rmgen/, so that one can use it without importing rmgen2, refs #4947, Belgian Uplands rP21171, Islets D1277.

Delete rmgen2 placeRadial which is equal to playerPlacementCircle from rP20149, refs #4805.
Remove createBase calls from rmgen2 player playerbase location functions, so that they can be called without placing the bases.
Let them return the same data that rmgen/ functions return, refs #4947.
Delete placeRandom as it remains empty.
Rename sortPlayersByLocation to groupPlayersCycle, groupPlayersByLocations to groupPlayersByArea,
randomPlayerLocations to playerPlacementRandom and addBases to createBasesByPattern.