Settlement rework.

1) Separated Population based on age:
0 - 10 years (children): cannot work and needs an adult to take care of them (1 adult/ 5 kids);
10 - 20 years (teenagers): cannot work but can take care of them;
20 - 30 years (young adults): can work and have a really low chance to die;
30 - 60 years (adults): can work and have a low chance to die, will also reproduce at least once;
60 - 80 years (seniors): cannot work and have a high chance to die;
2) New Settlement facility - School:
turns children and teenagers from uneducated to educated, allowing them to work after becoming 20;
if provided with school supplies, will turn teenagers and young adults from educated to well educated allowing them to work in more complex buildings like chemical plants, distillation towers, nuclear reactors etc.
different buildings now need special education workers in order to function (farms can work with uneducated or better workers, nuclear reactors only with well educated ones, etc.).