Release V1.1 (cave-update) and chainsaws

Today I added F2 as rescue key, if you are stuck somewhere. I also added chainsaws and released the next update (V1.1 cave-update).

Change log:
changes:
- improved cave system
- replaced patreon link, with a paypal donation button

added:
- chainsaws
- user defined names of villagers
- rescue key (F2), if you are stuck somewhere, because of a bug