Update EA-1.22 : Christmas!

- Added a new miracle : "Ho Ho Ho" only available each year during christmas.
Disclaimer : The result of this miracle may vary depending of your karma. ^^

- Removed the holes in the wooden houses as requested by the community.
- The tutorial has been improved and extended.
- Added a link to the discord server of the game in the main menu.
- Added a link to the manual of the game in the main menu.


- Reduce tornado sound volume.



- Updated to Unity 2018.2.18.
- Prevent the creation of multiple new towns in the same frame.
- Reduce the memory footprint of the humans looking for resources to gather.
- Reduce the cpu footprint of early european towns.



Expect a Dev log really soon about the roadmap for 2019. There is a small hint about what i'm doing behing the scene for the next big update.