chore: changelog for recent changes

[bahrmichael]

This PR has a changelog describing how I understand the changes in https://github.com/bahrmichael/factorio-tycoon/pull/271.

@winex would you mind reviewing this?

[winex]

@bahrmichael one of the first things in my pr-2 was the:

• map_gen_settings.starting_area being supported for those who reserves 0,0 for bases

it is now honored. if you set it to NORMAL=1.0 - you'll have industries very close to map center (256x256 clean, iirc), but if set it (just before disabling biters) to HIGH=6.0 -- ~1024x1024 area around center would be clean (as in vanilla) of anything we're placing additionally, except for:

• but it doesn't move Spawn Initial City thing yet -- i'll look into this a bit later (using new possibilities), so it will work better even if rbgen is disabled

you can call it something like this:

1. Starting area setting is now being supported. Sets the area around map center to keep clean of additional placements. Low-Normal: 256x256, High: 1024x1024 tiles

2. Map tags for cities are now placed again if deleted

everything else looks fine, thanks!