Some minor refactoring.
Add unittest of utils.crop
Changed crop functionality slightly, inspired by asechrest's unittest.
index on master: 23173eb Merge commit 'stash@{0}'
WIP on master: 23173eb Merge commit 'stash@{0}'
index on master: 23173eb Merge commit 'stash@{0}'
WIP on master: 23173eb Merge commit 'stash@{0}'
Merge branch 'master' of https://github.com/evennia/evennia

Conflicts:
	src/tests/test_utils_utils.py
Merge commit 'stash@{0}'
Merge commit 'stash@{1}'

Conflicts:
	src/tests/test_utils_utils.py