environmental citybuilder prototype

ktyl c22827967f extract heat system to class #7		2022-12-13 00:56:55 +00:00
half-earth	extract heat system to class #7	2022-12-13 00:56:55 +00:00
.gitignore	add gitignore	2022-12-03 16:26:13 +00:00
gdd.md	heat (#16)	2022-12-13 01:54:54 +01:00