Entitas 1.5.1

As always, the Unity Asset Store version might take a few days to be processed
and accepted by Unity. Please check for updates in 2 - 4 days here:
https://www.assetstore.unity3d.com/#!/content/87638

DesperateDevs

⚙️ Added better error message to EnsureStandalonePreProcessor

When EnsureStandalonePreProcessor is activated it will prevent you from accidentally generating in Unity.
To generate in Unity make sure EnsureStandalonePreProcessor is not activated.