Make it possible to set full screen preview as a default

manimlib/config.py

@@ -282,7 +282,7 @@ def get_configuration(args):
     mon_index = custom_config["window_monitor"]
     monitor = monitors[min(mon_index, len(monitors) - 1)]
     window_width = monitor.width
-    if not args.full_screen:
+    if not (args.full_screen or custom_config["full_screen"]):
         window_width //= 2
     window_height = window_width * 9 // 16
     config["window_config"] = {

manimlib/default_config.yml

@@ -34,6 +34,7 @@ style:
 # the window on the monitor, e.g. "960,540"
 window_position: UR
 window_monitor: 0
+full_screen: False
 # If break_into_partial_movies is set to True, then many small
 # files will be written corresponding to each Scene.play and
 # Scene.wait call, and these files will then be combined