Online updates/save heartbeat table etc.

News:
- Online updates from test github repository
- Removing offline clients after selected period of time
- Saving heartbeat table (can be disabled)
Added system.py it is handeling updates and cleaning of logs/heartbeat table. In the future should be able to fix errors in case program crashes.

server/version.json

@@ -1,4 +1,5 @@
 {
-  "version": "0.1",
-  "type": "Alpha"
-}
+  "version": "0.5",
+  "id": 3,
+  "url": "https://raw.githubusercontent.com/UntriexTv/test_directory/main/ver.json"
+}