Minor reshuffle of internal logic with intent to test it properly.
Porting parts of the app to Kotlin.
Merge branch 'master' of https://github.com/TassSinclair/Dumplings

Conflicts:
	Dumplings/src/main/java/net/sinclairstudios/android/dumplings/domain/DumplingOrderList.java
	Dumplings/src/main/java/net/sinclairstudios/android/dumplings/domain/Fraction.java