Added reset UI flag

Resets the ui theme to default and the transparency to default

EDMarketConnector - reset-ui.bat

@@ -0,0 +1 @@
+EDMarketConnector.exe --reset-ui

EDMarketConnector.py

@@ -1445,10 +1445,17 @@ if __name__ == "__main__":
                     "such as EDSM, Inara.cz and EDDB."
     )
 
-    parser.add_argument('--trace',
-                        help='Set the Debug logging loglevel to TRACE',
-                        action='store_true',
-                        )
+    parser.add_argument(
+        '--trace',
+        help='Set the Debug logging loglevel to TRACE',
+        action='store_true',
+    )
+
+    parser.add_argument(
+        '--reset-ui',
+        help='reset UI theme and transparency to defaults',
+        action='store_true'
+    )
 
     args = parser.parse_args()
 
@@ -1466,6 +1473,11 @@ executable: {sys.executable}
 sys.path: {sys.path}'''
                  )
 
+    if args.reset_ui:
+        config.set('theme', 0)  # 'Default' theme uses ID 0
+        config.set('ui_transparency', 100)  # 100 is completely opaque
+        logger.info('reset theme and transparency to default.')
+
     # We prefer a UTF-8 encoding gets set, but older Windows versions have
     # issues with this.  From Windows 10 1903 onwards we can rely on the
     # manifest ActiveCodePage to set this, but that is silently ignored on