Change the type of the variables for "FileType Supported" to list

Due to the bad performance of opening the big files, it is very necessary to add "FileType Supported". However, I found a bug that I couldn't make the plugin disable for a file without a extension. Besides, I often handle dataset files which are often big and have a variety of extensions and I don't think that it is convenient for me to add the file type to the config file when I meet a new file type. Luckily, vim recognize the type of these files as "".

Therefore, I suggest that you should change the type of the variables for "FileType Supported" to list and control the behaviors of the plugin depending on the value of the built-in variable "&ft".

Thanks for reading.