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/system.py

@@ -0,0 +1,72 @@
+import sys
+import os
+import json
+import zipfile
+import requests
+
+arguments = sys.argv
+arguments.remove(sys.argv[0])
+
+if len(arguments) == 0:
+    sys.exit()
+
+command = arguments[0]
+if command in ["u", "update"]:
+    with open("version.json", "r") as f:  # loading settings
+        version = json.load(f)
+    url = version["url"]
+    server_version = json.loads(requests.get(url).text)
+    if "-version" in arguments:
+        try:
+            version_download = arguments[arguments.index("-version") + 1]
+        except IndexError:
+            print("Version argument is empty.")
+            sys.exit()
+        if version_download not in list(server_version.keys()):
+            print("Version not found.")
+            sys.exit()
+
+    else:
+        for ver, data in enumerate(server_version.values()):
+            if data["id"] > version["id"]:
+                version_download = list(server_version.keys())[ver]
+
+    with open("update.zip", "wb") as save:
+        save.write(
+            bytes(requests.get(
+                f"https://github.com/UntriexTv/test_directory/releases/download/{version_download}/update.zip").content))
+    print("Download succefull")
+    print("Extracting update")
+    if not os.path.isdir("update"):
+        os.mkdir("update")
+    with zipfile.ZipFile("update.zip", "r") as zip_ref:
+        zip_ref.extractall("")
+    os.rmdir("update")
+    os.remove("update.zip")
+    print(f"update to {version_download} was succefull.")
+
+if command == "clean":
+    if arguments[1] == "all":
+        open("log.txt", "w").close()
+
+        with open("settings.json", "r") as file:
+            settings = json.load(file)
+
+        for line in settings["heartbeat_table"]:
+            settings["heartbeat_table"][line] = []
+
+        with open("settings.json", "w") as file:
+            json.dump(settings, file, indent=2)
+
+    if arguments[1] == "log":
+        open("log.txt", "w").close()
+
+    if arguments[1] == "heartbeat_table":
+        with open("settings.json", "r") as file:
+            settings = json.load(file)
+
+        for line in settings["heartbeat_table"]:
+            settings["heartbeat_table"][line] = []
+
+        with open("settings.json", "w") as file:
+            json.dump(settings, file, indent=2)