Add an option to enable/disable syntax script in rainbow_csv

[jiangyinzuo]

Recently vim added a simple syntax script for csv files. https://github.com/vim/vim/commit/1ce65e35ac6555054db1276e30d9d63421e6b346 Can we add a global option like g:disable_rainbow_csv_syntax to use vim's internal syntax script only?

[mechatroner]

Thanks for the heads up! I will look into this and the new built-in functionality compatibility with Rainbow CSV in general.