New section added

Everything that changed with this update:

- Off grid saves should be fixed

- Old save files should be now compatible with new game versions (they weren't before)

- Rules in levels should be consistent now

- Zones are numbered, starting with 0 for Tutorial levels

- Level 1-E1 is changed, because it was boring

- The new zone adds a new mechanic
- It has currently 7 levels, but hopefully I can add 1 or 2 more, before the next section