Added workers for industry and HQ, and mail for HQ

Fixed a few cargo injection bugs

added description

Added the Modern Construction Materials production chain.

prevented multiple HQ placements, and created industry categories

Fixed a crash when building the HQ with as new game

Added HQ interaction by the possibility to deliver PAPER to it.

fixed some issues, and introduced WASTE and a LANDFILL

fixed a cargo bug with the new bricks

Added CLAY and BRICK WORKS for the building materials plant