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/DatabaseScripts/changes/0002_budget_cant_be_negative.sql

@@ -0,0 +1,13 @@
+CREATE TRIGGER `fso_avatars_BEFORE_UPDATE` BEFORE UPDATE ON `fso_avatars` FOR EACH ROW BEGIN
+    IF NEW.budget<0 THEN
+        SIGNAL SQLSTATE '45000'
+            SET MESSAGE_TEXT = 'Transaction would cause avatar to have negative budget.';
+    END IF;
+END;
+
+CREATE TRIGGER `fso_objects_BEFORE_UPDATE` BEFORE UPDATE ON `fso_objects` FOR EACH ROW BEGIN
+    IF NEW.budget<0 THEN
+        SIGNAL SQLSTATE '45000'
+            SET MESSAGE_TEXT = 'Transaction would cause object to have negative budget.';
+    END IF;
+END;