v0.6.69 with some small fix and polish

Terraformers: First Steps on Mars

Terraformers: First Steps on Mars is a free prologue of Terraformers, featuring an exclusive challenge to lead humanity's first attempt at settling the Red Planet.

[b]Bug fix and polish[/b] [list] [*] Fixed a bug where a mine would display (resource_none) [*] Fixed a bug where spaceport would not work with some mines [*] Fixed a bug where you could select a project when founding a city [*] Fixed a bug where sandstorm could spawn on the first city too early [*] Fixed a bug displaying the sandstorm warning on lifeform spread [/list]