adjusted the host detection code

We no longer support subdirectories for the domain based setup. This is
in line with simplifying the whole thing.

Instead we check for matching animals from back an

adjusted the host detection code

We no longer support subdirectories for the domain based setup. This is
in line with simplifying the whole thing.

Instead we check for matching animals from back and without the hostname.

For a host header www.foobar.example.com:8000 the following animals would
match:

www.foobar.example.com.8000
foobar.example.com.8000
www.foobar.example.com
www.foobar.example
foobar.example.com
foobar.example
www.foobar
foobar
www

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adding animals works again

autoconfigure animal save dirs #18

no more accessing FARMCORE directly

all handling in single class now, 404 handling #21

added config screen, laid foundation for cascade management #13 #10