[feature] Allow user to change the path of temp file

[Freed-Wu]

Such as user can assign a variable to change ~/.rbql_table_index, ~/.rainbow_csv_storage to ~/.cache/nvim/.rbql_table_index, ~/.cache/nvim/.rainbow_csv_storage? or more compatible with XDG standard, $XDG_CACHE_HOME/nvim/.rbql_table_index, $XDG_CACHE_HOME/nvim/.rainbow_csv_storage?

Thanks!

[Freed-Wu]

let s:rb_storage_dir = $HOME . '/.rainbow_csv_storage'
let s:table_names_settings = $HOME . '/.rbql_table_names'
let s:rainbow_table_index = $HOME . '/.rbql_table_index'

Can these codes are changed?

[dther]

I made a patch for this! See my recent pull request, above.

[mechatroner]

I merged the patch. Thank you very much, @dther!