ui: Refactor offers page / Added TOR <> API / Cache

Restructure / Refactor JS for the Offers page.
Added TOR for chart/rates/coin prices/ API requests.
New Chart with option of show volume(coin) / refresh chart (will clear cache).
Added cache (10min) for all the API's or manual refresh.
Disabled notifications show new offers (was spam). New bids and Bid Accepted still active.
Various small fixes.

basicswap/base.py

@@ -15,6 +15,9 @@ import logging
 import threading
 import traceback
 import subprocess
+import urllib.request
+import urllib.error
+import json
 
 from sockshandler import SocksiPyHandler
 
@@ -162,20 +165,42 @@ class BaseApp:
             socket.getaddrinfo = self.default_socket_getaddrinfo
         socket.setdefaulttimeout(self.default_socket_timeout)
 
-    def readURL(self, url: str, timeout: int = 120, headers=None) -> bytes:
-        open_handler = None
-        if self.use_tor_proxy:
-            open_handler = SocksiPyHandler(socks.PROXY_TYPE_SOCKS5, self.tor_proxy_host, self.tor_proxy_port)
-        opener = urllib.request.build_opener(open_handler) if self.use_tor_proxy else urllib.request.build_opener()
-        opener.addheaders = [('User-agent', 'Mozilla/5.0')]
-        request = urllib.request.Request(url, headers=headers)
-        return opener.open(request, timeout=timeout).read()
-
-    def logException(self, message) -> None:
-        self.log.error(message)
-        if self.debug:
-            self.log.error(traceback.format_exc())
+    def is_tor_available(self):
+        if not hasattr(self, 'use_tor_proxy'):
+            return False
+        if not self.use_tor_proxy:
+            return False
+        try:
+            sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+            result = sock.connect_ex((self.tor_proxy_host, self.tor_proxy_port))
+            sock.close()
+            return result == 0
+        except:
+            return False
 
+    def readURL(self, url: str, timeout: int = 120, headers={}) -> bytes:
+        use_tor = self.is_tor_available()
+        try:
+            if use_tor:
+                proxy_handler = SocksiPyHandler(socks.PROXY_TYPE_SOCKS5, self.tor_proxy_host, self.tor_proxy_port)
+                opener = urllib.request.build_opener(proxy_handler)
+            else:
+                opener = urllib.request.build_opener()
+                
+            opener.addheaders = [(key, value) for key, value in headers.items()]
+            request = urllib.request.Request(url)
+            
+            with opener.open(request, timeout=timeout) as response:
+                return response.read()
+        except urllib.error.URLError as e:
+            if isinstance(e.reason, ConnectionRefusedError) and use_tor:
+                error_msg = f"Connection refused. Tor proxy might not be running. Error: {str(e)}"
+            else:
+                error_msg = f"URLError: {str(e)}"
+        except Exception as e:
+            error_msg = f"Unexpected error: {str(e)}"
+        return json.dumps({"Error": error_msg}).encode()
+        
     def torControl(self, query):
         try:
             command = 'AUTHENTICATE "{}"\r\n{}\r\nQUIT\r\n'.format(self.tor_control_password, query).encode('utf-8')