Re-implemented server state machine. Cleaned up code

TODO: Handle trigger errors

MoonlightServers.Shared/Enums/ServerState.cs

@@ -0,0 +1,10 @@
+namespace MoonlightServers.Shared.Enums;
+
+public enum ServerState
+{
+    Offline = 0,
+    Starting = 1,
+    Online = 2,
+    Stopping = 3,
+    Installing = 4
+}