Fix typos with codespell

Using codespell 2.2-dev from current git.

Added `misc/scripts/codespell.sh` to make it easier to run it once in a
while and update the skip and ignore lists.

(cherry picked from commit 1bdb82c64e)

modules/visual_script/visual_script_flow_control.cpp

@@ -778,7 +778,7 @@ public:
 			}
 
 			if (!ResourceCache::has(script)) {
-				//if the script is not in use by anyone, we can safely assume whathever we got is not casting to it.
+				//if the script is not in use by anyone, we can safely assume whatever we got is not casting to it.
 				return 1;
 			}
 			Ref<Script> cast_script = Ref<Resource>(ResourceCache::get(script));