Merge pull request #54 from Rutherther/test/packet-files

Add tests working with packet files

tests: add basic inventory, group, charater tests

chore: add mates and friends packet logs

fix: change packet logs extension to plog to avoid gitignore

chore: copy init_off_on log

chore: use Shouldly

tests: add game friends tests

chore: add Game test files with comments saying what tests to implement

tests(game): add basic test for mates

tests(game): add support for game integration tests