Added Custom Openssl Path for Native Clients

This Parameter helpful where openssl path is not fixed always, we can also use this to reduce code verbosity by providing other like these and provide them as parameter
```
            if sys.platform.startswith("win"):
                self.openssl_bin = "tools\\openssl\\openssl.exe"
            elif config.dist_type.startswith("bundle_linux"):
                self.openssl_bin = "../runtime/bin/openssl"
            else:
                self.openssl_bin = "openssl"
```

Also Fixed Tracker files provided are not loading on some systems like Android client where path storage access is restricted

src/Config.py

@@ -31,6 +31,7 @@ def __init__(self, argv):
 
         self.config_file = self.start_dir + "/zeronet.conf"
         self.data_dir = self.start_dir + "/data"
+        self.openssl_path = "default"
         self.log_dir = self.start_dir + "/log"
 
         self.trackers_file = False
@@ -108,6 +109,7 @@ def createArguments(self):
 
         config_file = self.start_dir + "/zeronet.conf"
         data_dir = self.start_dir + "/data"
+        openssl_path = "default"
         log_dir = self.start_dir + "/log"
 
         ip_local = ["127.0.0.1", "::1"]
@@ -259,6 +261,7 @@ def createArguments(self):
         self.parser.add_argument('--ip_external', help='Set reported external ip (tested on start if None)', metavar='ip', nargs='*')
         self.parser.add_argument('--offline', help='Disable network communication', action='store_true')
 
+        self.parser.add_argument('--openssl_path', help='Custom Path to OpenSSL Binary', default=openssl_path, metavar="path")
         self.parser.add_argument('--disable_udp', help='Disable UDP connections', action='store_true')
         self.parser.add_argument('--proxy', help='Socks proxy address', metavar='ip:port')
         self.parser.add_argument('--bind', help='Bind outgoing sockets to this address', metavar='ip')
@@ -321,6 +324,9 @@ def loadTrackersFile(self):
                     trackers_file_path = trackers_file
                 elif trackers_file.startswith("{data_dir}"):  # Relative to data_dir
                     trackers_file_path = trackers_file.replace("{data_dir}", self.data_dir)
+                elif trackers_file.startswith("data/"):
+                    # Relative to data_dir Useful for Unix Type Systems and Android Clients
+                    trackers_file_path = trackers_file.replace("data", self.data_dir)
                 else:  # Relative to zeronet.py
                     trackers_file_path = self.start_dir + "/" + trackers_file
 
@@ -479,7 +485,7 @@ def setAttributes(self):
             for key, val in args.items():
                 if type(val) is list:
                     val = val[:]
-                if key in ("data_dir", "log_dir"):
+                if key in ("data_dir", "log_dir", "openssl_path"):
                     val = val.replace("\\", "/")
                 setattr(self, key, val)
 
@@ -563,6 +569,7 @@ def getServerInfo(self):
 
             "log_dir": os.path.abspath(self.log_dir),
             "data_dir": os.path.abspath(self.data_dir),
+            "openssl_path": os.path.abspath(self.openssl_path),
             "src_dir": os.path.dirname(os.path.abspath(__file__))
         }
 

src/Crypt/CryptConnection.py

@@ -11,12 +11,15 @@
 
 class CryptConnectionManager:
     def __init__(self):
-        if sys.platform.startswith("win"):
-            self.openssl_bin = "tools\\openssl\\openssl.exe"
-        elif config.dist_type.startswith("bundle_linux"):
-            self.openssl_bin = "../runtime/bin/openssl"
+        if config.openssl_path != "default":
+            self.openssl_bin = config.openssl_path
         else:
-            self.openssl_bin = "openssl"
+            if sys.platform.startswith("win"):
+                self.openssl_bin = "tools\\openssl\\openssl.exe"
+            elif config.dist_type.startswith("bundle_linux"):
+                self.openssl_bin = "../runtime/bin/openssl"
+            else:
+                self.openssl_bin = "openssl"
 
         self.context_client = None
         self.context_server = None