beta patch update

Hi everyone ,

A small update to the beta branch with the following changes

• made traderoute resource icons smaller on map to be more discernable
  
• the inventory centers on the heal button if you only have the surveyor and no taskforce
  
• interval of waves reduced if your fleet is still small (auto balancing in total conquest mode)
  
• reduced height of house overlap prevention check to prevent weird placings
  
• potential fix for traderoutes suddenly not being shown on the map properly.
  

cheers!,
Tomas