* style: enforce sorting of imports

* style: alphabetize imports

* style: merge duplicated imports

* style: enforce ordering of imports

* style: sort imports in loot-core

* style: sort imports in desktop-client

* style: sort imports in loot-design

* style: manual fixes

* build: add linter to loot-design package

* style: automated fixes

* style: manual linter fixes

Tests impossible dates eg
- months outside 1-12 range
- days outside valid range for a given month

Previous implementation could not parse dates that are lacking delimiters.

Fix issue #116