Feature/112 api version (#119)

* Add api_version to status api and server_proxy.py

* Add api_version to Zeroconf and filter out incompatible versions when finding available servers

* Filter incompatible versions from the UI

src/api/api_server.py

@@ -25,11 +25,13 @@ from src.utilities.config import Config
 from src.utilities.misc_helper import system_safe_path, current_system_os, current_system_cpu, \
     current_system_os_version, num_to_alphanumeric
 from src.utilities.status_utils import string_to_status
+from version import APP_VERSION
 
 logger = logging.getLogger()
 server = Flask(__name__)
 ssl._create_default_https_context = ssl._create_unverified_context  # disable SSL for downloads
 
+API_VERSION = "1"
 
 def start_server(hostname=None):
 
@@ -236,7 +238,9 @@ def status():
             "memory_percent": psutil.virtual_memory().percent,
             "job_counts": RenderQueue.job_counts(),
             "hostname": server.config['HOSTNAME'],
-            "port": server.config['PORT']
+            "port": server.config['PORT'],
+            "app_version": APP_VERSION,
+            "api_version": API_VERSION
             }