A CNC machine for PCB manufacturing
As @stevenh said, they are 3 separate machines.


I can't answer.
At work we have a pick and place machine. It's pretty specialized since it has to take parts from various tubes and trays. As @stevenh said, this is an expensive machine. I wouldn't try that with a general CNC machine. 
Soldering by machine is done by wave or reflow. A soldering iron is likely not what you want. If you are a hobbyist, consider a toaster oven for reflow solution.