MAVCesium: Switch to newer fork

Signed-off-by: Ryan Friedman <25047695+Ryanf55@users.noreply.github.com>

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "MAVProxy/modules/mavproxy_cesium"]
 	path = MAVProxy/modules/mavproxy_cesium
-	url = https://github.com/SamuelDudley/MAVCesium.git
+	url = https://github.com/Ryanf55/MAVCesium.git

MAVProxy/mavproxy.py

@@ -1317,6 +1317,7 @@ def run_startup_scripts():
     if platform.system() == 'Windows':
         parser.add_option("--no-console", action='store_true', help="don't use GUI console")
     parser.add_option("--map", action='store_true', help="load map module")
+    parser.add_option("--mavcesium", action='store_true', help="Load the MAVCesium web-based 3D map display module")
     parser.add_option(
         '--load-module',
         action='append',
@@ -1516,6 +1517,9 @@ def quit_handler(signum = None, frame = None):
     if opts.map:
         process_stdin('module load map')
 
+    if opts.mavcesium:
+        process_stdin('module load cesium')
+
     if (mpstate.settings.state_basedir is not None and
         opts.aircraft is not None):
         mpstate.aircraft_dir = os.path.join(mpstate.settings.state_basedir, opts.aircraft)