Removed NioTSO client and server

- NioTSO client isn't needed because we're using RayLib
- Added FreeSO's API server to handle most backend operations

server/FSO.Server.Database/DA/AbstractSqlDA.cs

@@ -0,0 +1,12 @@
+namespace FSO.Server.Database.DA
+{
+    public class AbstractSqlDA
+    {
+        protected ISqlContext Context;
+
+        public AbstractSqlDA(ISqlContext context)
+        {
+            this.Context = context;
+        }
+    }
+}