Don't build between minerals and command center

[alkurbatov]

[ImpulseCloud]

This is a simple solution for now. As this is a starter bot, I'd like new coders to understand the buffer exclusion zone, rather than use a more complicated algorithm. Eventually, it would be best to use a cached build_grid (0.5x0.5 cells) and mark those cells as reserved/off-limits which intersect a line segment between the base and each mineral/geyser.

[ImpulseCloud]

alkurbatov: "we can use the placement grid abstraction from the api and mark the related tiles as occupied."