Reorganize all observatory core projects into monorepo (#25)

* chore: move all observatory repos to core

* only save journal folder on change, don't constantly re-check during monitoring

* chore: monorepo project changes

* chore: monorepo migration

ObservatoryExplorer/CriteriaLoadException.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Observatory.Explorer
+{
+    internal class CriteriaLoadException : Exception
+    {
+        public CriteriaLoadException(string message, string script)
+        {
+            Message = message;
+            OriginalScript = script;
+        }
+
+        new public readonly string Message;
+        public readonly string OriginalScript;
+    }
+}