Fixed namespaces in existing tests
* MapTests.cs:
* Rothko.Tests.csproj:
* SelectCommandTests.cs: Tests for selecting units

* Map.cs: Properties for selected unit added, initialized lists on
  construction

* SelectCommand.cs: Added select command
* Rothko.csproj: Added select command and imoveable interface

* Unit.cs: Unit now has move points

* IMoveable.cs: Interface to define which game objects can move
* MoveCommandTests.cs: Added tests for the move command

* MoveCommand.cs: Preparing the command for the move points logic