Rename `main` to `run`

By convention, the entry point for the console script is a function called
`main`. This function encompasses all the code currently in the `if __name__ ==
"__main__":` block. But there is already a function called `main`, for the main
loop. So we rename this function to `run`, choosing a short name with similar
meaning.

bpytop.py

@@ -4470,7 +4470,7 @@ if __name__ == "__main__":
 
 	#? Main loop ------------------------------------------------------------------------------------->
 
-	def main():
+	def run():
 		while not False:
 			Term.refresh()
 			Timer.stamp()
@@ -4483,7 +4483,7 @@ if __name__ == "__main__":
 
 	#? Start main loop
 	try:
-		main()
+		run()
 	except Exception as e:
 		errlog.exception(f'{e}')
 		clean_quit(1)