Log building toy generator

This is my take on the classic timber log construction toy.

The log is designed to work well as a generator to allow generating different shapes of logs and of different lengths. Additionally, a few special treats are included in the generator.

The default size of the log is not based on the original building set. I have elaborated a size which is big enough to make good pieces on the printer, to be simple to build with but I can still fit a 4-notch piece in my i3.

If you have a better printer, you could probably reduce the tolerance parameters to make a better fit in the notches.

**Update 1**
Upon request from the kids I have implemented a post piece. This piece will make a post to be used instead of stacking multiple 1-notch pieces. The stacks tends to become unstable and the post works much better. The post works best with the flat logs. Hex logs are hard to print and round logs will not fit together.

There are lots of other additions as well, but I'll leave those to